256121375 has 16 divisors (see below), whose sum is σ = 322100064. Its totient is φ = 203320000.

The previous prime is 256121357. The next prime is 256121413. The reversal of 256121375 is 573121652.

256121375 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 256121375 - 2⁸ = 256121119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8555 + ... + 24195.

It is an arithmetic number, because the mean of its divisors is an integer number (20131254).

Almost surely, 2^256121375 is an apocalyptic number.

256121375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256121375 is a deficient number, since it is larger than the sum of its proper divisors (65978689).

256121375 is a wasteful number, since it uses less digits than its factorization.

256121375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15787 (or 15777 counting only the distinct ones).

The product of its digits is 12600, while the sum is 32.

The square root of 256121375 is about 16003.7925192749. The cubic root of 256121375 is about 635.0607543086.

The spelling of 256121375 in words is "two hundred fifty-six million, one hundred twenty-one thousand, three hundred seventy-five".