99888537931 has 32 divisors (see below), whose sum is σ = 126948233216. Its totient is φ = 76457520000.

The previous prime is 99888537883. The next prime is 99888537937. The reversal of 99888537931 is 13973588899.

It is a 7-Lehmer number, since φ(99888537931) divides (99888537931-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 99888537931 - 2⁷ = 99888537803 is a prime.

It is a super-2 number, since 2×99888537931² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99888537937) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16079416 + ... + 16085626.

It is an arithmetic number, because the mean of its divisors is an integer number (3967132288).

Almost surely, 2^99888537931 is an apocalyptic number.

99888537931 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

99888537931 is a deficient number, since it is larger than the sum of its proper divisors (27059695285).

99888537931 is a wasteful number, since it uses less digits than its factorization.

99888537931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11963.

The product of its digits is 117573120, while the sum is 70.

The spelling of 99888537931 in words is "ninety-nine billion, eight hundred eighty-eight million, five hundred thirty-seven thousand, nine hundred thirty-one".