9989991112 has 32 divisors (see below), whose sum is σ = 19838724120. Its totient is φ = 4699832320.

The previous prime is 9989991073. The next prime is 9989991119. The reversal of 9989991112 is 2111999899.

It can be written as a sum of positive squares in 4 ways, for example, as 9630281956 + 359709156 = 98134^2 + 18966^2 .

It is not an unprimeable number, because it can be changed into a prime (9989991119) 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, 597912 + ... + 614392.

Almost surely, 2^9989991112 is an apocalyptic number.

It is an amenable number.

9989991112 is a deficient number, since it is larger than the sum of its proper divisors (9848733008).

9989991112 is a wasteful number, since it uses less digits than its factorization.

9989991112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20961 (or 20957 counting only the distinct ones).

The product of its digits is 944784, while the sum is 58.

The square root of 9989991112 is about 99949.9430314995. The cubic root of 9989991112 is about 2153.7156669072.

The spelling of 9989991112 in words is "nine billion, nine hundred eighty-nine million, nine hundred ninety-one thousand, one hundred twelve".