9999998631 has 96 divisors (see below), whose sum is σ = 17712414720. Its totient is φ = 5313772800.

The previous prime is 9999998611. The next prime is 9999998633. The reversal of 9999998631 is 1368999999.

It is not a de Polignac number, because 9999998631 - 2⁵ = 9999998599 is a prime.

It is a super-2 number, since 2×9999998631² (a number of 21 digits) contains 22 as substring.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9999998631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999998633) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21691741 + ... + 21692201.

It is an arithmetic number, because the mean of its divisors is an integer number (184504320).

Almost surely, 2^9999998631 is an apocalyptic number.

9999998631 is a deficient number, since it is larger than the sum of its proper divisors (7712416089).

9999998631 is a wasteful number, since it uses less digits than its factorization.

9999998631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 914 counting only the distinct ones).

The product of its digits is 76527504, while the sum is 72.

The square root of 9999998631 is about 99999.9931549998. The cubic root of 9999998631 is about 2154.4345917178.

The spelling of 9999998631 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-eight thousand, six hundred thirty-one".