256265091 has 6 divisors (see below), whose sum is σ = 370160700. Its totient is φ = 170843388.

The previous prime is 256265077. The next prime is 256265159. The reversal of 256265091 is 190562652.

256265091 is a `hidden beast` number, since 2 + 562 + 6 + 5 + 0 + 91 = 666.

256265091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256265091 - 2⁵ = 256265059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256265041) 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, 14236941 + ... + 14236958.

It is an arithmetic number, because the mean of its divisors is an integer number (61693450).

Almost surely, 2^256265091 is an apocalyptic number.

256265091 is a deficient number, since it is larger than the sum of its proper divisors (113895609).

256265091 is a wasteful number, since it uses less digits than its factorization.

256265091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28473905 (or 28473902 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 256265091 is about 16008.2819502906. The cubic root of 256265091 is about 635.1795148321.

The spelling of 256265091 in words is "two hundred fifty-six million, two hundred sixty-five thousand, ninety-one".