99111531512 has 16 divisors (see below), whose sum is σ = 212381853360. Its totient is φ = 42476370624.

The previous prime is 99111531511. The next prime is 99111531521. The reversal of 99111531512 is 21513511199.

It is a happy number.

It is a super-2 number, since 2×99111531512² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99111531511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884924333 + ... + 884924444.

It is an arithmetic number, because the mean of its divisors is an integer number (13273865835).

Almost surely, 2^99111531512 is an apocalyptic number.

It is an amenable number.

99111531512 is an abundant number, since it is smaller than the sum of its proper divisors (113270321848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99111531512 is a wasteful number, since it uses less digits than its factorization.

99111531512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769848790 (or 1769848786 counting only the distinct ones).

The product of its digits is 12150, while the sum is 38.

The spelling of 99111531512 in words is "ninety-nine billion, one hundred eleven million, five hundred thirty-one thousand, five hundred twelve".