251456 has 14 divisors (see below), whose sum is σ = 499110. Its totient is φ = 125696.

The previous prime is 251443. The next prime is 251467. The reversal of 251456 is 654152.

It can be written as a sum of positive squares in only one way, i.e., 173056 + 78400 = 416^2 + 280^2 .

It is a nialpdrome in base 8.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 251456.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1901 + ... + 2028.

2²⁵¹⁴⁵⁶ is an apocalyptic number.

It is an amenable number.

251456 is a deficient number, since it is larger than the sum of its proper divisors (247654).

251456 is an equidigital number, since it uses as much as digits as its factorization.

251456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3941 (or 3931 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 251456 is about 501.4538862149. The cubic root of 251456 is about 63.1181121786.

It can be divided in two parts, 251 and 456, that added together give a palindrome (707).

The spelling of 251456 in words is "two hundred fifty-one thousand, four hundred fifty-six".