99999988631 has 8 divisors (see below), whose sum is σ = 100953039744. Its totient is φ = 99047279800.

The previous prime is 99999988603. The next prime is 99999988663. The reversal of 99999988631 is 13688999999.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99999988631 is a prime.

It is a super-2 number, since 2×99999988631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999988691) 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, 521966 + ... + 687348.

It is an arithmetic number, because the mean of its divisors is an integer number (12619129968).

Almost surely, 2^99999988631 is an apocalyptic number.

99999988631 is a deficient number, since it is larger than the sum of its proper divisors (953051113).

99999988631 is a wasteful number, since it uses less digits than its factorization.

99999988631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171141.

The product of its digits is 612220032, while the sum is 80.

The spelling of 99999988631 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred eighty-eight thousand, six hundred thirty-one".