256455513 has 6 divisors (see below), whose sum is σ = 370435754. Its totient is φ = 170970336.

The previous prime is 256455503. The next prime is 256455517. The reversal of 256455513 is 315554652.

256455513 is a `hidden beast` number, since 2 + 5 + 645 + 5 + 5 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 175509504 + 80946009 = 13248^2 + 8997^2 .

It is not a de Polignac number, because 256455513 - 2⁵ = 256455481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256455517) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14247520 + ... + 14247537.

Almost surely, 2^256455513 is an apocalyptic number.

It is an amenable number.

256455513 is a deficient number, since it is larger than the sum of its proper divisors (113980241).

256455513 is a wasteful number, since it uses less digits than its factorization.

256455513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28495063 (or 28495060 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

The square root of 256455513 is about 16014.2284547211. The cubic root of 256455513 is about 635.3368027495.

The spelling of 256455513 in words is "two hundred fifty-six million, four hundred fifty-five thousand, five hundred thirteen".