256652881 has 4 divisors (see below), whose sum is σ = 256745572. Its totient is φ = 256560192.

The previous prime is 256652863. The next prime is 256652897. The reversal of 256652881 is 188256652.

256652881 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 2 ways, for example, as 178489600 + 78163281 = 13360^2 + 8841^2 .

It is a cyclic number.

It is not a de Polignac number, because 256652881 - 2⁹ = 256652369 is a prime.

It is a super-2 number, since 2×256652881² = 131741402651200322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256652861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42060 + ... + 47773.

It is an arithmetic number, because the mean of its divisors is an integer number (64186393).

Almost surely, 2^256652881 is an apocalyptic number.

It is an amenable number.

256652881 is a deficient number, since it is larger than the sum of its proper divisors (92691).

256652881 is an equidigital number, since it uses as much as digits as its factorization.

256652881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92690.

The product of its digits is 230400, while the sum is 43.

The square root of 256652881 is about 16020.3895395836. The cubic root of 256652881 is about 635.4997458897.

The spelling of 256652881 in words is "two hundred fifty-six million, six hundred fifty-two thousand, eight hundred eighty-one".