99881131 has 12 divisors (see below), whose sum is σ = 116881392. Its totient is φ = 83610576.

The previous prime is 99881123. The next prime is 99881149. The reversal of 99881131 is 13118899.

It is a happy number.

It is not a de Polignac number, because 99881131 - 2³ = 99881123 is a prime.

It is a super-2 number, since 2×99881131² = 19952480659678322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99881161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9085 + ... + 16801.

It is an arithmetic number, because the mean of its divisors is an integer number (9740116).

Almost surely, 2^99881131 is an apocalyptic number.

99881131 is a deficient number, since it is larger than the sum of its proper divisors (17000261).

99881131 is an equidigital number, since it uses as much as digits as its factorization.

99881131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7810 (or 7767 counting only the distinct ones).

The product of its digits is 15552, while the sum is 40.

The square root of 99881131 is about 9994.0547827196. The cubic root of 99881131 is about 463.9748967666.

The spelling of 99881131 in words is "ninety-nine million, eight hundred eighty-one thousand, one hundred thirty-one".