99818209 has 2 divisors, whose sum is σ = 99818210. Its totient is φ = 99818208.

The previous prime is 99818197. The next prime is 99818219. The reversal of 99818209 is 90281899.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92544400 + 7273809 = 9620^2 + 2697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99818209 is a prime.

It is not a weakly prime, because it can be changed into another prime (99818219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49909104 + 49909105.

It is an arithmetic number, because the mean of its divisors is an integer number (49909105).

Almost surely, 2^99818209 is an apocalyptic number.

It is an amenable number.

99818209 is a deficient number, since it is larger than the sum of its proper divisors (1).

99818209 is an equidigital number, since it uses as much as digits as its factorization.

99818209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 99818209 is about 9990.9063152449. The cubic root of 99818209 is about 463.8774463914.

The spelling of 99818209 in words is "ninety-nine million, eight hundred eighteen thousand, two hundred nine".