99581309 has 2 divisors, whose sum is σ = 99581310. Its totient is φ = 99581308.

The previous prime is 99581281. The next prime is 99581311. The reversal of 99581309 is 90318599.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93180409 + 6400900 = 9653^2 + 2530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99581309 is a prime.

Together with 99581311, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_5738678 and since 99581309 and 5738678 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99581309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99581399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49790654 + 49790655.

It is an arithmetic number, because the mean of its divisors is an integer number (49790655).

Almost surely, 2^99581309 is an apocalyptic number.

It is an amenable number.

99581309 is a deficient number, since it is larger than the sum of its proper divisors (1).

99581309 is an equidigital number, since it uses as much as digits as its factorization.

99581309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 99581309 is about 9979.0434912370. The cubic root of 99581309 is about 463.5101800062.

The spelling of 99581309 in words is "ninety-nine million, five hundred eighty-one thousand, three hundred nine".