99999031212311 has 16 divisors (see below), whose sum is σ = 124675817545728. Its totient is φ = 77920260079200.

The previous prime is 99999031212281. The next prime is 99999031212337. The reversal of 99999031212311 is 11321213099999.

It is not a de Polignac number, because 99999031212311 - 2³⁸ = 99724153305367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999031212011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3152855 + ... + 14489256.

It is an arithmetic number, because the mean of its divisors is an integer number (7792238596608).

Almost surely, 2^{99999031212311} is an apocalyptic number.

99999031212311 is a deficient number, since it is larger than the sum of its proper divisors (24676786333417).

99999031212311 is a wasteful number, since it uses less digits than its factorization.

99999031212311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17715742.

The product of its (nonzero) digits is 2125764, while the sum is 59.

The spelling of 99999031212311 in words is "ninety-nine trillion, nine hundred ninety-nine billion, thirty-one million, two hundred twelve thousand, three hundred eleven".