8991990513 has 12 divisors (see below), whose sum is σ = 14169197328. Its totient is φ = 5449691160.

The previous prime is 8991990457. The next prime is 8991990551. The reversal of 8991990513 is 3150991998.

It is not a de Polignac number, because 8991990513 - 2¹⁴ = 8991974129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8991990513.

It is not an unprimeable number, because it can be changed into a prime (8991990593) 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, 45413995 + ... + 45414192.

It is an arithmetic number, because the mean of its divisors is an integer number (1180766444).

Almost surely, 2^8991990513 is an apocalyptic number.

It is an amenable number.

8991990513 is a deficient number, since it is larger than the sum of its proper divisors (5177206815).

8991990513 is a wasteful number, since it uses less digits than its factorization.

8991990513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90828204 (or 90828201 counting only the distinct ones).

The product of its (nonzero) digits is 787320, while the sum is 54.

The square root of 8991990513 is about 94826.1067059067. The cubic root of 8991990513 is about 2079.4665879017.

The spelling of 8991990513 in words is "eight billion, nine hundred ninety-one million, nine hundred ninety thousand, five hundred thirteen".