99579917 has 2 divisors, whose sum is σ = 99579918. Its totient is φ = 99579916.

The previous prime is 99579899. The next prime is 99579947. The reversal of 99579917 is 71997599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53421481 + 46158436 = 7309^2 + 6794^2 .

It is a cyclic number.

It is not a de Polignac number, because 99579917 - 2²⁶ = 32471053 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99579947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49789958 + 49789959.

It is an arithmetic number, because the mean of its divisors is an integer number (49789959).

Almost surely, 2^99579917 is an apocalyptic number.

It is an amenable number.

99579917 is a deficient number, since it is larger than the sum of its proper divisors (1).

99579917 is an equidigital number, since it uses as much as digits as its factorization.

99579917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1607445, while the sum is 56.

The square root of 99579917 is about 9978.9737448297. The cubic root of 99579917 is about 463.5080202663.

The spelling of 99579917 in words is "ninety-nine million, five hundred seventy-nine thousand, nine hundred seventeen".