99988888631 has 2 divisors, whose sum is σ = 99988888632. Its totient is φ = 99988888630.

The previous prime is 99988888603. The next prime is 99988888717. The reversal of 99988888631 is 13688888999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99988888631 is a prime.

It is a super-2 number, since 2×99988888631² (a number of 23 digits) contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99988888231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49994444315 + 49994444316.

It is an arithmetic number, because the mean of its divisors is an integer number (49994444316).

Almost surely, 2^99988888631 is an apocalyptic number.

99988888631 is a deficient number, since it is larger than the sum of its proper divisors (1).

99988888631 is an equidigital number, since it uses as much as digits as its factorization.

99988888631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 429981696, while the sum is 77.

The spelling of 99988888631 in words is "ninety-nine billion, nine hundred eighty-eight million, eight hundred eighty-eight thousand, six hundred thirty-one".