256331975 has 6 divisors (see below), whose sum is σ = 317851680. Its totient is φ = 205065560.

The previous prime is 256331947. The next prime is 256331989. The reversal of 256331975 is 579133652.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-256331975 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5126615 + ... + 5126664.

It is an arithmetic number, because the mean of its divisors is an integer number (52975280).

Almost surely, 2^256331975 is an apocalyptic number.

256331975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256331975 is a deficient number, since it is larger than the sum of its proper divisors (61519705).

256331975 is a wasteful number, since it uses less digits than its factorization.

256331975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10253289 (or 10253284 counting only the distinct ones).

The product of its digits is 170100, while the sum is 41.

The square root of 256331975 is about 16010.3708576660. The cubic root of 256331975 is about 635.2347696609.

The spelling of 256331975 in words is "two hundred fifty-six million, three hundred thirty-one thousand, nine hundred seventy-five".