99031987755691 has 2 divisors, whose sum is σ = 99031987755692. Its totient is φ = 99031987755690.

The previous prime is 99031987755671. The next prime is 99031987755697. The reversal of 99031987755691 is 19655778913099.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99031987755691 - 2⁷ = 99031987755563 is a prime.

It is not a weakly prime, because it can be changed into another prime (99031987755697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49515993877845 + 49515993877846.

It is an arithmetic number, because the mean of its divisors is an integer number (49515993877846).

Almost surely, 2^{99031987755691} is an apocalyptic number.

99031987755691 is a deficient number, since it is larger than the sum of its proper divisors (1).

99031987755691 is an equidigital number, since it uses as much as digits as its factorization.

99031987755691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1157360400, while the sum is 79.

The spelling of 99031987755691 in words is "ninety-nine trillion, thirty-one billion, nine hundred eighty-seven million, seven hundred fifty-five thousand, six hundred ninety-one".