856539522 has 24 divisors (see below), whose sum is σ = 1924571376. Its totient is φ = 285513012.

The previous prime is 856539511. The next prime is 856539539. The reversal of 856539522 is 225935658.

856539522 is a `hidden beast` number, since 8 + 565 + 39 + 52 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 880728 + ... + 881699.

It is an arithmetic number, because the mean of its divisors is an integer number (80190474).

Almost surely, 2^856539522 is an apocalyptic number.

856539522 is an abundant number, since it is smaller than the sum of its proper divisors (1068031854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856539522 is a wasteful number, since it uses less digits than its factorization.

856539522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762444 (or 1762432 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The square root of 856539522 is about 29266.6964654366. The cubic root of 856539522 is about 949.6913205809.

The spelling of 856539522 in words is "eight hundred fifty-six million, five hundred thirty-nine thousand, five hundred twenty-two".