99590809 has 2 divisors, whose sum is σ = 99590810. Its totient is φ = 99590808.

The previous prime is 99590807. The next prime is 99590819. The reversal of 99590809 is 90809599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83814025 + 15776784 = 9155^2 + 3972^2 .

It is an emirp because it is prime and its reverse (90809599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99590809 - 2¹ = 99590807 is a prime.

Together with 99590807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99590801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49795404 + 49795405.

It is an arithmetic number, because the mean of its divisors is an integer number (49795405).

Almost surely, 2^99590809 is an apocalyptic number.

It is an amenable number.

99590809 is a deficient number, since it is larger than the sum of its proper divisors (1).

99590809 is an equidigital number, since it uses as much as digits as its factorization.

99590809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 49.

The square root of 99590809 is about 9979.5194774097. The cubic root of 99590809 is about 463.5249190730.

The spelling of 99590809 in words is "ninety-nine million, five hundred ninety thousand, eight hundred nine".