256022813 has 2 divisors, whose sum is σ = 256022814. Its totient is φ = 256022812.

The previous prime is 256022801. The next prime is 256022887. The reversal of 256022813 is 318220652.

256022813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242020249 + 14002564 = 15557^2 + 3742^2 .

It is a cyclic number.

It is not a de Polignac number, because 256022813 - 2²² = 251828509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256022213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128011406 + 128011407.

It is an arithmetic number, because the mean of its divisors is an integer number (128011407).

Almost surely, 2^256022813 is an apocalyptic number.

It is an amenable number.

256022813 is a deficient number, since it is larger than the sum of its proper divisors (1).

256022813 is an equidigital number, since it uses as much as digits as its factorization.

256022813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 256022813 is about 16000.7128903684. The cubic root of 256022813 is about 634.9792813626.

The spelling of 256022813 in words is "two hundred fifty-six million, twenty-two thousand, eight hundred thirteen".