99611917 has 2 divisors, whose sum is σ = 99611918. Its totient is φ = 99611916.

The previous prime is 99611909. The next prime is 99611933. The reversal of 99611917 is 71911699.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94070601 + 5541316 = 9699^2 + 2354^2 .

It is a cyclic number.

It is not a de Polignac number, because 99611917 - 2³ = 99611909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99611117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49805958 + 49805959.

It is an arithmetic number, because the mean of its divisors is an integer number (49805959).

Almost surely, 2^99611917 is an apocalyptic number.

It is an amenable number.

99611917 is a deficient number, since it is larger than the sum of its proper divisors (1).

99611917 is an equidigital number, since it uses as much as digits as its factorization.

99611917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 43.

The square root of 99611917 is about 9980.5769873289. The cubic root of 99611917 is about 463.5576643732.

The spelling of 99611917 in words is "ninety-nine million, six hundred eleven thousand, nine hundred seventeen".