99115979 has 2 divisors, whose sum is σ = 99115980. Its totient is φ = 99115978.

The previous prime is 99115957. The next prime is 99115987. The reversal of 99115979 is 97951199.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99115979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99115879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49557989 + 49557990.

It is an arithmetic number, because the mean of its divisors is an integer number (49557990).

Almost surely, 2^99115979 is an apocalyptic number.

99115979 is a deficient number, since it is larger than the sum of its proper divisors (1).

99115979 is an equidigital number, since it uses as much as digits as its factorization.

99115979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 229635, while the sum is 50.

The square root of 99115979 is about 9955.7008291732. The cubic root of 99115979 is about 462.7870790380.

The spelling of 99115979 in words is "ninety-nine million, one hundred fifteen thousand, nine hundred seventy-nine".