256355023 has 2 divisors, whose sum is σ = 256355024. Its totient is φ = 256355022.

The previous prime is 256355009. The next prime is 256355039. The reversal of 256355023 is 320553652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256355023 - 2⁵ = 256354991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256355003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128177511 + 128177512.

It is an arithmetic number, because the mean of its divisors is an integer number (128177512).

Almost surely, 2^256355023 is an apocalyptic number.

256355023 is a deficient number, since it is larger than the sum of its proper divisors (1).

256355023 is an equidigital number, since it uses as much as digits as its factorization.

256355023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 31.

The square root of 256355023 is about 16011.0906249387. The cubic root of 256355023 is about 635.2538080611.

The spelling of 256355023 in words is "two hundred fifty-six million, three hundred fifty-five thousand, twenty-three".