99999999931 has 8 divisors (see below), whose sum is σ = 109983633984. Its totient is φ = 90343698240.

The previous prime is 99999999907. The next prime is 99999999943. The reversal of 99999999931 is 13999999999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99999999931 - 2¹¹ = 99999997883 is a prime.

It is a super-2 number, since 2×99999999931² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99999999431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81832450 + ... + 81833671.

It is an arithmetic number, because the mean of its divisors is an integer number (13747954248).

Almost surely, 2^99999999931 is an apocalyptic number.

99999999931 is a deficient number, since it is larger than the sum of its proper divisors (9983634053).

99999999931 is a wasteful number, since it uses less digits than its factorization.

99999999931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163666181.

The product of its digits is 1162261467, while the sum is 85.

The spelling of 99999999931 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred thirty-one".