256394571 has 16 divisors (see below), whose sum is σ = 354733344. Its totient is φ = 164588544.

The previous prime is 256394563. The next prime is 256394587. The reversal of 256394571 is 175493652.

It is not a de Polignac number, because 256394571 - 2³ = 256394563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256390571) 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 in 15 ways as a sum of consecutive naturals, for example, 1140 + ... + 22673.

It is an arithmetic number, because the mean of its divisors is an integer number (22170834).

Almost surely, 2^256394571 is an apocalyptic number.

256394571 is a deficient number, since it is larger than the sum of its proper divisors (98338773).

256394571 is a wasteful number, since it uses less digits than its factorization.

256394571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23950.

The product of its digits is 226800, while the sum is 42.

The square root of 256394571 is about 16012.3255962399. The cubic root of 256394571 is about 635.2864733411.

The spelling of 256394571 in words is "two hundred fifty-six million, three hundred ninety-four thousand, five hundred seventy-one".