256903813 has 16 divisors (see below), whose sum is σ = 287470080. Its totient is φ = 228324096.

The previous prime is 256903799. The next prime is 256903817. The reversal of 256903813 is 318309652.

It is a cyclic number.

It is not a de Polignac number, because 256903813 - 2⁵ = 256903781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256903817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26731 + ... + 35047.

It is an arithmetic number, because the mean of its divisors is an integer number (17966880).

Almost surely, 2^256903813 is an apocalyptic number.

256903813 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

256903813 is a deficient number, since it is larger than the sum of its proper divisors (30566267).

256903813 is a wasteful number, since it uses less digits than its factorization.

256903813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8436.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 256903813 is about 16028.2192710232. The cubic root of 256903813 is about 635.7067898407.

The spelling of 256903813 in words is "two hundred fifty-six million, nine hundred three thousand, eight hundred thirteen".