256465631 has 8 divisors (see below), whose sum is σ = 262758144. Its totient is φ = 250188120.

The previous prime is 256465613. The next prime is 256465639. The reversal of 256465631 is 136564652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256465631 - 2⁶ = 256465567 is a prime.

It is a super-2 number, since 2×256465631² = 131549239768456322, 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 (256465639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35900 + ... + 42446.

It is an arithmetic number, because the mean of its divisors is an integer number (32844768).

Almost surely, 2^256465631 is an apocalyptic number.

256465631 is a deficient number, since it is larger than the sum of its proper divisors (6292513).

256465631 is an equidigital number, since it uses as much as digits as its factorization.

256465631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7501.

The product of its digits is 129600, while the sum is 38.

The square root of 256465631 is about 16014.5443581764. The cubic root of 256465631 is about 635.3451580040.

The spelling of 256465631 in words is "two hundred fifty-six million, four hundred sixty-five thousand, six hundred thirty-one".