99565399 has 4 divisors (see below), whose sum is σ = 99609664. Its totient is φ = 99521136.

The previous prime is 99565393. The next prime is 99565451. The reversal of 99565399 is 99356599.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99356599 = 821 ⋅121019.

It is a cyclic number.

It is not a de Polignac number, because 99565399 - 2²³ = 91176791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99565393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18567 + ... + 23320.

It is an arithmetic number, because the mean of its divisors is an integer number (24902416).

Almost surely, 2^99565399 is an apocalyptic number.

99565399 is a deficient number, since it is larger than the sum of its proper divisors (44265).

99565399 is a wasteful number, since it uses less digits than its factorization.

99565399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44264.

The product of its digits is 2952450, while the sum is 55.

The square root of 99565399 is about 9978.2462888025. The cubic root of 99565399 is about 463.4854938483.

The spelling of 99565399 in words is "ninety-nine million, five hundred sixty-five thousand, three hundred ninety-nine".