99388309 has 2 divisors, whose sum is σ = 99388310. Its totient is φ = 99388308.

The previous prime is 99388301. The next prime is 99388321. The reversal of 99388309 is 90388399.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79834225 + 19554084 = 8935^2 + 4422^2 .

It is a cyclic number.

It is not a de Polignac number, because 99388309 - 2³ = 99388301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99388301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49694154 + 49694155.

It is an arithmetic number, because the mean of its divisors is an integer number (49694155).

Almost surely, 2^99388309 is an apocalyptic number.

It is an amenable number.

99388309 is a deficient number, since it is larger than the sum of its proper divisors (1).

99388309 is an equidigital number, since it uses as much as digits as its factorization.

99388309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 99388309 is about 9969.3685356696. The cubic root of 99388309 is about 463.2105410448.

The spelling of 99388309 in words is "ninety-nine million, three hundred eighty-eight thousand, three hundred nine".