251560256 has 28 divisors (see below), whose sum is σ = 511370580. Its totient is φ = 122711040.

The previous prime is 251560229. The next prime is 251560303. The reversal of 251560256 is 652065152.

It can be written as a sum of positive squares in 2 ways, for example, as 27040000 + 224520256 = 5200^2 + 14984^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45311 + ... + 50558.

It is an arithmetic number, because the mean of its divisors is an integer number (18263235).

Almost surely, 2^251560256 is an apocalyptic number.

It is an amenable number.

251560256 is an abundant number, since it is smaller than the sum of its proper divisors (259810324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251560256 is an equidigital number, since it uses as much as digits as its factorization.

251560256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95922 (or 95912 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 251560256 is about 15860.6511846141. The cubic root of 251560256 is about 631.2683409238.

The spelling of 251560256 in words is "two hundred fifty-one million, five hundred sixty thousand, two hundred fifty-six".