8539516521 has 12 divisors (see below), whose sum is σ = 12871155648. Its totient is φ = 5445488664.

The previous prime is 8539516511. The next prime is 8539516537. The reversal of 8539516521 is 1256159358.

8539516521 is a `hidden beast` number, since 8 + 539 + 51 + 65 + 2 + 1 = 666.

It is not a de Polignac number, because 8539516521 - 2³⁰ = 7465774697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8539516511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20626645 + ... + 20627058.

It is an arithmetic number, because the mean of its divisors is an integer number (1072596304).

Almost surely, 2^8539516521 is an apocalyptic number.

It is an amenable number.

8539516521 is a deficient number, since it is larger than the sum of its proper divisors (4331639127).

8539516521 is a wasteful number, since it uses less digits than its factorization.

8539516521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41253732 (or 41253729 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The square root of 8539516521 is about 92409.5044949382. The cubic root of 8539516521 is about 2043.9852667018.

The spelling of 8539516521 in words is "eight billion, five hundred thirty-nine million, five hundred sixteen thousand, five hundred twenty-one".