256579 has 2 divisors, whose sum is σ = 256580. Its totient is φ = 256578.

The previous prime is 256577. The next prime is 256589. The reversal of 256579 is 975652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256579 - 2¹ = 256577 is a prime.

Together with 256577, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (256577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128289 + 128290.

It is an arithmetic number, because the mean of its divisors is an integer number (128290).

2²⁵⁶⁵⁷⁹ is an apocalyptic number.

256579 is a deficient number, since it is larger than the sum of its proper divisors (1).

256579 is an equidigital number, since it uses as much as digits as its factorization.

256579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 34.

The square root of 256579 is about 506.5362770819. The cubic root of 256579 is about 63.5438760974.

The spelling of 256579 in words is "two hundred fifty-six thousand, five hundred seventy-nine".