99708809 has 2 divisors, whose sum is σ = 99708810. Its totient is φ = 99708808.

The previous prime is 99708781. The next prime is 99708839. The reversal of 99708809 is 90880799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96098809 + 3610000 = 9803^2 + 1900^2 .

It is an emirp because it is prime and its reverse (90880799) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99708809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99708839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49854404 + 49854405.

It is an arithmetic number, because the mean of its divisors is an integer number (49854405).

Almost surely, 2^99708809 is an apocalyptic number.

It is an amenable number.

99708809 is a deficient number, since it is larger than the sum of its proper divisors (1).

99708809 is an equidigital number, since it uses as much as digits as its factorization.

99708809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 99708809 is about 9985.4298355153. The cubic root of 99708809 is about 463.7079157205.

The spelling of 99708809 in words is "ninety-nine million, seven hundred eight thousand, eight hundred nine".