99999013831 has 2 divisors, whose sum is σ = 99999013832. Its totient is φ = 99999013830.

The previous prime is 99999013811. The next prime is 99999013949. The reversal of 99999013831 is 13831099999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99999013831 - 2⁵ = 99999013799 is a prime.

It is a super-2 number, since 2×99999013831² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99999013831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99999013811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999506915 + 49999506916.

It is an arithmetic number, because the mean of its divisors is an integer number (49999506916).

Almost surely, 2^99999013831 is an apocalyptic number.

99999013831 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999013831 is an equidigital number, since it uses as much as digits as its factorization.

99999013831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4251528, while the sum is 61.

The spelling of 99999013831 in words is "ninety-nine billion, nine hundred ninety-nine million, thirteen thousand, eight hundred thirty-one".