99931013977 has 2 divisors, whose sum is σ = 99931013978. Its totient is φ = 99931013976.

The previous prime is 99931013953. The next prime is 99931014011. The reversal of 99931013977 is 77931013999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71804705296 + 28126308681 = 267964^2 + 167709^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99931013977 is a prime.

It is not a weakly prime, because it can be changed into another prime (99931019977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49965506988 + 49965506989.

It is an arithmetic number, because the mean of its divisors is an integer number (49965506989).

Almost surely, 2^99931013977 is an apocalyptic number.

It is an amenable number.

99931013977 is a deficient number, since it is larger than the sum of its proper divisors (1).

99931013977 is an equidigital number, since it uses as much as digits as its factorization.

99931013977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2893401, while the sum is 58.

The spelling of 99931013977 in words is "ninety-nine billion, nine hundred thirty-one million, thirteen thousand, nine hundred seventy-seven".