256523291 has 2 divisors, whose sum is σ = 256523292. Its totient is φ = 256523290.

The previous prime is 256523287. The next prime is 256523297. The reversal of 256523291 is 192325652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256523291 - 2² = 256523287 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256523297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128261645 + 128261646.

It is an arithmetic number, because the mean of its divisors is an integer number (128261646).

Almost surely, 2^256523291 is an apocalyptic number.

256523291 is a deficient number, since it is larger than the sum of its proper divisors (1).

256523291 is an equidigital number, since it uses as much as digits as its factorization.

256523291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 35.

The square root of 256523291 is about 16016.3444955458. The cubic root of 256523291 is about 635.3927683558.

The spelling of 256523291 in words is "two hundred fifty-six million, five hundred twenty-three thousand, two hundred ninety-one".