256279531 has 2 divisors, whose sum is σ = 256279532. Its totient is φ = 256279530.

The previous prime is 256279481. The next prime is 256279589. The reversal of 256279531 is 135972652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256279531 - 2¹⁹ = 255755243 is a prime.

It is a super-2 number, since 2×256279531² = 131358396019159922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256279591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128139765 + 128139766.

It is an arithmetic number, because the mean of its divisors is an integer number (128139766).

Almost surely, 2^256279531 is an apocalyptic number.

256279531 is a deficient number, since it is larger than the sum of its proper divisors (1).

256279531 is an equidigital number, since it uses as much as digits as its factorization.

256279531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 40.

The square root of 256279531 is about 16008.7329604813. The cubic root of 256279531 is about 635.1914449522.

The spelling of 256279531 in words is "two hundred fifty-six million, two hundred seventy-nine thousand, five hundred thirty-one".