249 (number)
249 (two hundred [and] forty-nine) is the natural number following 248 and preceding 250.
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| Cardinal | two hundred forty-nine | |||
| Ordinal | 249th (two hundred forty-ninth) | |||
| Factorization | 3 × 83 | |||
| Greek numeral | ΣΜΘ´ | |||
| Roman numeral | CCXLIX | |||
| Binary | 111110012 | |||
| Ternary | 1000203 | |||
| Octal | 3718 | |||
| Duodecimal | 18912 | |||
| Hexadecimal | F916 | |||
In mathematics
249 is:
- a Blum integer.[1]
- a semiprime.
- palindromic in bases 82 (3382) and 248 (11248).
- a Harshad number in bases 3, 83, 84, 124, 167 and 247.
- the aliquot sum of any of these numbers: 375, 531, 1687, 4351, 7807, 12127, 14647 and 15151.
- part of the 3-aliquot tree. The aliquot sequence starting at 288 is: 288, 531, 249, 87, 33, 15, 9, 4, 3, 1, 0.
References
- "Sloane's A016105 : Blum integers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
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