191 (number)
191 (one hundred [and] ninety-one) is the natural number following 190 and preceding 192.
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| Cardinal | one hundred ninety-one | |||
| Ordinal | 191st (one hundred ninety-first) | |||
| Factorization | prime | |||
| Prime | yes | |||
| Greek numeral | ΡϞΑ´ | |||
| Roman numeral | CXCI | |||
| Binary | 101111112 | |||
| Ternary | 210023 | |||
| Octal | 2778 | |||
| Duodecimal | 13B12 | |||
| Hexadecimal | BF16 | |||
In mathematics
- 191 is an odd number
- 191 is a centered 19-gonal number[1]
- 191 is a deficient number, as 1 is less than 191
- 191 is a lazy caterer, number of slices a circle can be made into (19 slices can divide into 191 pieces)
- 191 is an odious number
- 191 is a prime number
- Chen prime
- Eisenstein prime with no imaginary part
- Gaussian prime
- Palindromic prime, in base 10
- Part of a prime quadruplet of four primes: 191, 193, 197, and 199
- Sophie Germain prime
- Strong prime
- Twin prime that differs from another prime number (193) by 2
- The smallest prime that is not a full reptend prime in any base from 2 to 10 – in fact the smallest base for which 191 is a full period prime is base 19.[2]
- 191 is a square-free number
- 191 is a Thabit number
- 191 is an undulating number
- 191 is the smallest positive integer d such that the imaginary quadratic field Q(√–d) has class number = 13.[3]
In astronomy
In geography
- 191 Peachtree Tower at 191 Peachtree Street is the fourth tallest skyscraper in Atlanta
- 191 North Wacker is a 37-story skyscraper in Chicago
- Marquis No. 191, Saskatchewan is a rural municipality in Saskatchewan, Canada
In the military
- 191st Air Refueling Squadron unit of the Utah Air National Guard
- 191st Airlift Group unit the Michigan Air National Guard at Selfridge ANGB, Michigan
- 191st Battalion, CEF was a unit of the Canadian Expeditionary Force in Southern Alberta, Canada
- 191st Infantry Brigade formed as part of the United States Army Reserve's 95th Division
- Focke-Wulf Fw 191 was a prototype German bomber aircraft of World War II
- No. 191 Squadron RAF a Royal Air Force squadron from 1917–1919, and 1943–1945
- Special Order 191 was a military order issued by Confederate Army General Robert E. Lee in the Maryland Campaign of the American Civil War
- USNS Benjamin Isherwood (T-AO-191) is a United States Navy Henry J. Kaiser-class fleet replenishment oiler
- USS Coffman (DE-191) was a United States Navy Cannon-class destroyer escort during World War II
- USS Frigate Bird (AMS-191) was a United States Navy Bluebird-class minesweeper during the 1950s
- USS Lebanon (AK-191) was a United States Navy C1-M-AV1-type cargo ship during World War II
- USS Mason (DD-191) was a United States Navy Clemson-class destroyer during World War II
- USS Pondera (APA-191) was a United States Navy Haskell-class attack transport during World War II
- USS Sculpin (SS-191) was a United States Navy Sargo-class submarine during World War II
- USS Vandalia (IX-191) was a United States Navy a twin-screw, steel-hulled tanker during World War II
- VF-191, "Satan's Kittens", was a fighter squadron of the United States Navy during World War II
In movies
- The 2008 movie “Highway 191”
In transportation
- RD-191, a Russian high performance single-combustion chamber rocket engine
- 191st Street (IRT Broadway – Seventh Avenue Line), a New York City Subway station at St. Nicholas Avenue in Manhattan served by the 1 train
- At least five known plane crashes have involved flights numbered 191; as a result, the number is considered unlucky in the airline industry and has been withdrawn from use in some airlines
In other fields
191 is also:
- The year AD 191 or 191 BC
- The atomic number of an element temporarily called Unennunium
- Minuscule 191 is a Greek minuscule manuscript of the New Testament, on parchment
- Bose Virtually Invisible 191 speakers
See also
External links
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Wikimedia Commons has media related to 191 (number). |
References
- "Sloane's A069132 : Centered 19-gonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
- Wolfram MathWorld; Primitive Root
- "Tables of imaginary quadratic fields with small class number". numbertheory.org.
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