256513258 has 4 divisors (see below), whose sum is σ = 384769890. Its totient is φ = 128256628.

The previous prime is 256513253. The next prime is 256513291. The reversal of 256513258 is 852315652.

It is a happy number.

256513258 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 161976529 + 94536729 = 12727^2 + 9723^2 .

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (256513253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64128313 + ... + 64128316.

Almost surely, 2^256513258 is an apocalyptic number.

256513258 is a deficient number, since it is larger than the sum of its proper divisors (128256632).

256513258 is a wasteful number, since it uses less digits than its factorization.

256513258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128256631.

The product of its digits is 72000, while the sum is 37.

The square root of 256513258 is about 16016.0312811882. The cubic root of 256513258 is about 635.3844845352.

The spelling of 256513258 in words is "two hundred fifty-six million, five hundred thirteen thousand, two hundred fifty-eight".