99318809 has 2 divisors, whose sum is σ = 99318810. Its totient is φ = 99318808.

The previous prime is 99318803. The next prime is 99318893. The reversal of 99318809 is 90881399.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55056400 + 44262409 = 7420^2 + 6653^2 .

It is a cyclic number.

It is not a de Polignac number, because 99318809 - 2²⁴ = 82541593 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (99318803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49659404 + 49659405.

It is an arithmetic number, because the mean of its divisors is an integer number (49659405).

Almost surely, 2^99318809 is an apocalyptic number.

It is an amenable number.

99318809 is a deficient number, since it is larger than the sum of its proper divisors (1).

99318809 is an equidigital number, since it uses as much as digits as its factorization.

99318809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 99318809 is about 9965.8822489532. The cubic root of 99318809 is about 463.1025449776.

The spelling of 99318809 in words is "ninety-nine million, three hundred eighteen thousand, eight hundred nine".