8981990521 has 12 divisors (see below), whose sum is σ = 10902719232. Its totient is φ = 7364115528.

The previous prime is 8981990509. The next prime is 8981990527. The reversal of 8981990521 is 1250991898.

It is not a de Polignac number, because 8981990521 - 2⁹ = 8981990009 is a prime.

It is a super-3 number, since 3×8981990521³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8981990527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3983785 + ... + 3986038.

It is an arithmetic number, because the mean of its divisors is an integer number (908559936).

Almost surely, 2^8981990521 is an apocalyptic number.

It is an amenable number.

8981990521 is a deficient number, since it is larger than the sum of its proper divisors (1920728711).

8981990521 is a wasteful number, since it uses less digits than its factorization.

8981990521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7969860 (or 7969853 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 52.

The square root of 8981990521 is about 94773.3639848243. The cubic root of 8981990521 is about 2078.6954437539.

The spelling of 8981990521 in words is "eight billion, nine hundred eighty-one million, nine hundred ninety thousand, five hundred twenty-one".