856521875 has 24 divisors (see below), whose sum is σ = 1167956496. Its totient is φ = 622900000.

The previous prime is 856521851. The next prime is 856521889. The reversal of 856521875 is 578125658.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-856521875 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21917 + ... + 46833.

It is an arithmetic number, because the mean of its divisors is an integer number (48664854).

Almost surely, 2^856521875 is an apocalyptic number.

856521875 is a deficient number, since it is larger than the sum of its proper divisors (311434621).

856521875 is an equidigital number, since it uses as much as digits as its factorization.

856521875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24953 (or 24933 counting only the distinct ones).

The product of its digits is 672000, while the sum is 47.

The square root of 856521875 is about 29266.3949778581. The cubic root of 856521875 is about 949.6847984776.

The spelling of 856521875 in words is "eight hundred fifty-six million, five hundred twenty-one thousand, eight hundred seventy-five".