99866909 has 2 divisors, whose sum is σ = 99866910. Its totient is φ = 99866908.

The previous prime is 99866873. The next prime is 99866911. The reversal of 99866909 is 90966899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93122500 + 6744409 = 9650^2 + 2597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99866909 is a prime.

It is a Sophie Germain prime.

Together with 99866911, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99866929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49933454 + 49933455.

It is an arithmetic number, because the mean of its divisors is an integer number (49933455).

Almost surely, 2^99866909 is an apocalyptic number.

It is an amenable number.

99866909 is a deficient number, since it is larger than the sum of its proper divisors (1).

99866909 is an equidigital number, since it uses as much as digits as its factorization.

99866909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1889568, while the sum is 56.

The square root of 99866909 is about 9993.3432343736. The cubic root of 99866909 is about 463.9528740411.

The spelling of 99866909 in words is "ninety-nine million, eight hundred sixty-six thousand, nine hundred nine".