8521315984 has 40 divisors (see below), whose sum is σ = 16580248568. Its totient is φ = 4242585600.

The previous prime is 8521315981. The next prime is 8521315993. The reversal of 8521315984 is 4895131258.

It can be written as a sum of positive squares in 4 ways, for example, as 271590400 + 8249725584 = 16480^2 + 90828^2 .

It is a super-2 number, since 2×8521315984² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8521315981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7094584 + ... + 7095784.

Almost surely, 2^8521315984 is an apocalyptic number.

It is an amenable number.

8521315984 is a deficient number, since it is larger than the sum of its proper divisors (8058932584).

8521315984 is a wasteful number, since it uses less digits than its factorization.

8521315984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2723 (or 2717 counting only the distinct ones).

The product of its digits is 345600, while the sum is 46.

The square root of 8521315984 is about 92310.9743421658. The cubic root of 8521315984 is about 2042.5320973729.

The spelling of 8521315984 in words is "eight billion, five hundred twenty-one million, three hundred fifteen thousand, nine hundred eighty-four".