256511013 has 16 divisors (see below), whose sum is σ = 376805952. Its totient is φ = 153920000.

The previous prime is 256510999. The next prime is 256511023. The reversal of 256511013 is 310115652.

It is a cyclic number.

It is not a de Polignac number, because 256511013 - 2⁴ = 256510997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256511023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35148 + ... + 41813.

It is an arithmetic number, because the mean of its divisors is an integer number (23550372).

Almost surely, 2^256511013 is an apocalyptic number.

It is an amenable number.

256511013 is a deficient number, since it is larger than the sum of its proper divisors (120294939).

256511013 is a wasteful number, since it uses less digits than its factorization.

256511013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77076.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 256511013 is about 16015.9611950079. The cubic root of 256511013 is about 635.3826309048.

Adding to 256511013 its reverse (310115652), we get a palindrome (566626665).

The spelling of 256511013 in words is "two hundred fifty-six million, five hundred eleven thousand, thirteen".