256266539 has 2 divisors, whose sum is σ = 256266540. Its totient is φ = 256266538.

The previous prime is 256266503. The next prime is 256266557. The reversal of 256266539 is 935662652.

256266539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256266539 is a prime.

It is a super-2 number, since 2×256266539² = 131345078022077042, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256266539.

It is not a weakly prime, because it can be changed into another prime (256266589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128133269 + 128133270.

It is an arithmetic number, because the mean of its divisors is an integer number (128133270).

Almost surely, 2^256266539 is an apocalyptic number.

256266539 is a deficient number, since it is larger than the sum of its proper divisors (1).

256266539 is an equidigital number, since it uses as much as digits as its factorization.

256266539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 44.

The square root of 256266539 is about 16008.3271768164. The cubic root of 256266539 is about 635.1807111690.

The spelling of 256266539 in words is "two hundred fifty-six million, two hundred sixty-six thousand, five hundred thirty-nine".