256604631 has 8 divisors (see below), whose sum is σ = 349419264. Its totient is φ = 167429880.

The previous prime is 256604627. The next prime is 256604653. The reversal of 256604631 is 136406652.

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

It is not a de Polignac number, because 256604631 - 2² = 256604627 is a prime.

It is a super-2 number, since 2×256604631² = 131691873301292322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256604592 and 256604601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256602631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 909805 + ... + 910086.

It is an arithmetic number, because the mean of its divisors is an integer number (43677408).

Almost surely, 2^256604631 is an apocalyptic number.

256604631 is a deficient number, since it is larger than the sum of its proper divisors (92814633).

256604631 is a wasteful number, since it uses less digits than its factorization.

256604631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1819941.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 256604631 is about 16018.8835753307. The cubic root of 256604631 is about 635.4599193552.

The spelling of 256604631 in words is "two hundred fifty-six million, six hundred four thousand, six hundred thirty-one".