251 (number)

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251 is the natural number between 250 and 252. It is also a prime number.

Ordinal Two hundred [and]
fifty-one
Cardinal 251st
Factorization prime number

[edit] In mathematics

251 is a regular prime, an Eisenstein prime, a Chen prime, a Gaussian prime, a Sophie Germain prime, and a sexy prime.

251 is also sum of three consecutive primes (79 + 83 + 89) and sum of seven consecutive primes (23 + 29 + 31 + 37 + 41 + 43 + 47).

251 is also the smallest number that can be written as the sum of three cubes in two ways: 251 = 13 + 53 + 53 = 23 + 33 + 63.

[edit] In other fields

Vermont 251 Club is a club in which members try to visit each of the 251 towns and cities of Vermont.