251279 has 4 divisors (see below), whose sum is σ = 287184. Its totient is φ = 215376.

The previous prime is 251263. The next prime is 251287. The reversal of 251279 is 972152.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 251279 - 2⁴ = 251263 is a prime.

It is a super-2 number, since 2×251279² = 126282271682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17942 + ... + 17955.

It is an arithmetic number, because the mean of its divisors is an integer number (71796).

2²⁵¹²⁷⁹ is an apocalyptic number.

251279 is a deficient number, since it is larger than the sum of its proper divisors (35905).

251279 is an equidigital number, since it uses as much as digits as its factorization.

251279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35904.

The product of its digits is 1260, while the sum is 26.

The square root of 251279 is about 501.2773683301. The cubic root of 251279 is about 63.1032990792.

The spelling of 251279 in words is "two hundred fifty-one thousand, two hundred seventy-nine".