256260931 has 4 divisors (see below), whose sum is σ = 256304664. Its totient is φ = 256217200.

The previous prime is 256260929. The next prime is 256260959. The reversal of 256260931 is 139062652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256260931 - 2¹ = 256260929 is a prime.

It is a super-2 number, since 2×256260931² = 131339329513973522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256260031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11410 + ... + 25351.

It is an arithmetic number, because the mean of its divisors is an integer number (64076166).

Almost surely, 2^256260931 is an apocalyptic number.

256260931 is a deficient number, since it is larger than the sum of its proper divisors (43733).

256260931 is an equidigital number, since it uses as much as digits as its factorization.

256260931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43732.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 256260931 is about 16008.1520170193. The cubic root of 256260931 is about 635.1760778168.

The spelling of 256260931 in words is "two hundred fifty-six million, two hundred sixty thousand, nine hundred thirty-one".