181 (number)
181 (one hundred [and] eighty-one) is the natural number following 180 and preceding 182.
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| Cardinal | one hundred eighty-one | |||
| Ordinal | 181st (one hundred eighty-first) | |||
| Factorization | prime | |||
| Prime | 42nd | |||
| Divisors | 1, 181 | |||
| Greek numeral | ΡΠΑ´ | |||
| Roman numeral | CLXXXI | |||
| Binary | 101101012 | |||
| Ternary | 202013 | |||
| Octal | 2658 | |||
| Duodecimal | 13112 | |||
| Hexadecimal | B516 | |||
In mathematics
- 181 is an odd number
- 181 is a centered number
- 181 is a centered pentagonal number[1]
- 181 is a centered 12-gonal number[2]
- 181 is a centered 18-gonal number[3]
- 181 is a centered 30-gonal number
- 181 is a centered square number[4]
- 181 is a star number that represents a centered hexagram (as in the game of Chinese checkers)
- 181 is a deficient number, as 1 is less than 181
- 181 is an odious number
- 181 is a prime number
- 181 is a Chen prime[5]
- 181 is a dihedral prime
- 181 is a full reptend prime[6]
- 181 is a palindromic prime
- 181 is a strobogrammatic prime, the same when viewed upside down
- 181 is a twin prime with 179
- 181 is a square-free number
- 181 is an undulating number, if written in the ternary, the negaternary, or the nonary numeral systems
- 181 is the difference of 2 square numbers: 912 – 902
- 181 is the sum of 2 consecutive square numbers: 92 + 102
- 181 is the sum of 5 consecutive prime numbers: 29 + 31 + 37 + 41 + 43
In geography
- Langenburg No. 181, Saskatchewan rural municipality in Saskatchewan, Canada
- 181 Fremont Street proposed skyscraper in San Francisco, California
- 181 West Madison Street, Chicago
In the military
- 181st (Brandon) Battalion, CEF was a unit in the Canadian Expeditionary Force during World War I
- 181st Airlift Squadron is a unit of the Texas Air National Guard
- 181st Infantry Brigade of the United States Army based at Fort McCoy, Wisconsin
- 181st Intelligence Wing is a unit of the United States Air Force located at Hulman Field, Terre Haute, Indiana
- AN/APQ-181 an all-weather, low probability of intercept (LPI) radar system for the U.S. Air Force B-2A Spirit bomber aircraft
- Bücker Bü 181 Bestmann single-engine trainer aircraft during World War II
- USNS Adelphi (T-AG-181) was a ship scheduled to be acquired by the United States Navy, however, the program was cancelled
- USNS Fred C. Ainsworth (T-AP-181) was a United States Navy troop transport during World War II
- USNS Potomac (T-AO-181) was a United States Navy oiler following the Vietnam War
- USS Accokeek (ATA-181) was a United States Navy ATA-174-class auxiliary ocean tugboat during World War II
- USS Flagler (AK-181) was a United States Navy Alamosa-class cargo ship following World War II
- USS Hopewell (DD-181) was a United States Navy Wickes-class destroyer following World War I
- USS Pompano (SS-181) was a United States Navy Porpoise-class submarine during World War II
- USS Straub (DE-181) was a United States Navy Cannon-class destroyer escort during World War II
In movies
- “181: Fragments of a Journey in Palestine-Israel,” winner of the 2005 Yamagata International Documentary Film Festival
- The war film “The Enemy Below” revolves around the fictitious Buckley-class destroyer escort, USS Hayes (DE-181) and a German U-boat
In transportation
- The Volkswagen 181
- Lufthansa Flight 181, which was hijacked on October 13, 1977
- London Buses route 181
- 181 Union City-New York, a New Jersey Transit bus route from New Jersey to New York
- The Córas Iompair Éireann CIE 181 Class diesel locomotives, and numbered B181 to B192, built by General Motors Electro-Motive Division (EMD) in 1966
- East 181st Avenue, a light rail station on the MAX Blue Line in Gresham, Oregon
- New York City Subway stations in Manhattan:
- 181st Street (IND Eighth Avenue Line), at Fort Washington Avenue served by the A train
- 181st Street (IRT Broadway – Seventh Avenue Line), at St. Nicholas Avenue served by the 1 train
- 181st Street (Manhattan)
- Oregon Route 229, also known as the Siletz Highway No. 181
In other fields
181 is also:
- The year AD 181 or 181 BC
- The atomic number of an element temporarily called Unoctunium
- 181 Eucharis is a large K-type Main belt asteroid
- Minuscule 181 (in the Gregory-Aland numbering), α 101 (Soden), is a Greek minuscule manuscript of the New Testament
- Mir-181 microRNA precursor is a small non-coding RNA molecule
- The number of channels on an older American television set, with 68 over-the-air television channels (12 VHF channels [2 through 13] and 56 UHF channels [14 through 69]) and 113 cable television channels (channel 1 and channels 14 through 125, excluding VHF channels 2 through 13)
See also
- List of highways numbered 181
- United Nations Security Council Resolution 181
- United Nations General Assembly Resolution 181 (II) Future Government of Palestine
- United States Supreme Court cases, Volume 181
- Pennsylvania House of Representatives, District 181
- Criminal Code of Belarus, Article 181
- Constitution of Malaysia, Article 181
References
- "Sloane's A005891 : Centered pentagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
- "Sloane's A003154 : Centered 12-gonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
- "Sloane's A069131 : Centered 18-gonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
- "Sloane's A001844 : Centered square numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
- "Sloane's A109611 : Chen primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
- "Sloane's A001913 : Full reptend primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
External links
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Wikimedia Commons has media related to 181 (number). |
- Number Facts and Trivia: 181
- The Number 181
- The Positive Integer 181
- Prime curiosities: 181
- VirtueScience: 181
- Number Gossip: 181
- 181 FM Internet radio
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