256630251 has 32 divisors (see below), whose sum is σ = 371496960. Its totient is φ = 157094784.

The previous prime is 256630229. The next prime is 256630271. The reversal of 256630251 is 152036652.

It is not a de Polignac number, because 256630251 - 2⁵ = 256630219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256630271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 554046 + ... + 554508.

It is an arithmetic number, because the mean of its divisors is an integer number (11609280).

Almost surely, 2^256630251 is an apocalyptic number.

256630251 is a deficient number, since it is larger than the sum of its proper divisors (114866709).

256630251 is a wasteful number, since it uses less digits than its factorization.

256630251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 256630251 is about 16019.6832365687. The cubic root of 256630251 is about 635.4810672476.

The spelling of 256630251 in words is "two hundred fifty-six million, six hundred thirty thousand, two hundred fifty-one".