99312905991 has 32 divisors (see below), whose sum is σ = 147632486400. Its totient is φ = 58995834624.

The previous prime is 99312905963. The next prime is 99312906031. The reversal of 99312905991 is 19950921399.

It is not a de Polignac number, because 99312905991 - 2¹⁴ = 99312889607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99312905491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 237291 + ... + 504908.

It is an arithmetic number, because the mean of its divisors is an integer number (4613515200).

Almost surely, 2^99312905991 is an apocalyptic number.

99312905991 is a deficient number, since it is larger than the sum of its proper divisors (48319580409).

99312905991 is a wasteful number, since it uses less digits than its factorization.

99312905991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742335.

The product of its (nonzero) digits is 1771470, while the sum is 57.

The spelling of 99312905991 in words is "ninety-nine billion, three hundred twelve million, nine hundred five thousand, nine hundred ninety-one".