256075817 has 2 divisors, whose sum is σ = 256075818. Its totient is φ = 256075816.

The previous prime is 256075763. The next prime is 256075843. The reversal of 256075817 is 718570652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172554496 + 83521321 = 13136^2 + 9139^2 .

It is a cyclic number.

It is not a de Polignac number, because 256075817 - 2¹⁶ = 256010281 is a prime.

It is not a weakly prime, because it can be changed into another prime (256075867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128037908 + 128037909.

It is an arithmetic number, because the mean of its divisors is an integer number (128037909).

Almost surely, 2^256075817 is an apocalyptic number.

It is an amenable number.

256075817 is a deficient number, since it is larger than the sum of its proper divisors (1).

256075817 is an equidigital number, since it uses as much as digits as its factorization.

256075817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 117600, while the sum is 41.

The square root of 256075817 is about 16002.3691058543. The cubic root of 256075817 is about 635.0230979260.

The spelling of 256075817 in words is "two hundred fifty-six million, seventy-five thousand, eight hundred seventeen".