256644313 has 2 divisors, whose sum is σ = 256644314. Its totient is φ = 256644312.

The previous prime is 256644239. The next prime is 256644337. The reversal of 256644313 is 313446652.

256644313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130576329 + 126067984 = 11427^2 + 11228^2 .

It is a cyclic number.

It is not a de Polignac number, because 256644313 - 2⁹ = 256643801 is a prime.

It is not a weakly prime, because it can be changed into another prime (256644413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128322156 + 128322157.

It is an arithmetic number, because the mean of its divisors is an integer number (128322157).

Almost surely, 2^256644313 is an apocalyptic number.

It is an amenable number.

256644313 is a deficient number, since it is larger than the sum of its proper divisors (1).

256644313 is an equidigital number, since it uses as much as digits as its factorization.

256644313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 34.

The square root of 256644313 is about 16020.1221281237. The cubic root of 256644313 is about 635.4926740522.

The spelling of 256644313 in words is "two hundred fifty-six million, six hundred forty-four thousand, three hundred thirteen".