99965209 has 2 divisors, whose sum is σ = 99965210. Its totient is φ = 99965208.

The previous prime is 99965207. The next prime is 99965221. The reversal of 99965209 is 90256999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95491984 + 4473225 = 9772^2 + 2115^2 .

It is a cyclic number.

It is not a de Polignac number, because 99965209 - 2¹ = 99965207 is a prime.

Together with 99965207, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99965207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49982604 + 49982605.

It is an arithmetic number, because the mean of its divisors is an integer number (49982605).

Almost surely, 2^99965209 is an apocalyptic number.

It is an amenable number.

99965209 is a deficient number, since it is larger than the sum of its proper divisors (1).

99965209 is an equidigital number, since it uses as much as digits as its factorization.

99965209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 393660, while the sum is 49.

The square root of 99965209 is about 9998.2602986720. The cubic root of 99965209 is about 464.1050486119.

The spelling of 99965209 in words is "ninety-nine million, nine hundred sixty-five thousand, two hundred nine".