99719309 has 2 divisors, whose sum is σ = 99719310. Its totient is φ = 99719308.

The previous prime is 99719303. The next prime is 99719317. The reversal of 99719309 is 90391799.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68392900 + 31326409 = 8270^2 + 5597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99719309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99719303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49859654 + 49859655.

It is an arithmetic number, because the mean of its divisors is an integer number (49859655).

Almost surely, 2^99719309 is an apocalyptic number.

It is an amenable number.

99719309 is a deficient number, since it is larger than the sum of its proper divisors (1).

99719309 is an equidigital number, since it uses as much as digits as its factorization.

99719309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 137781, while the sum is 47.

The square root of 99719309 is about 9985.9555877242. The cubic root of 99719309 is about 463.7241923239.

The spelling of 99719309 in words is "ninety-nine million, seven hundred nineteen thousand, three hundred nine".