99999599 has 16 divisors (see below), whose sum is σ = 116444160. Its totient is φ = 84110400.

The previous prime is 99999589. The next prime is 99999611. The reversal of 99999599 is 99599999.

It is a cyclic number.

It is not a de Polignac number, because 99999599 - 2⁸ = 99999343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93542 + ... + 94604.

It is an arithmetic number, because the mean of its divisors is an integer number (7277760).

Almost surely, 2^99999599 is an apocalyptic number.

99999599 is a deficient number, since it is larger than the sum of its proper divisors (16444561).

99999599 is a wasteful number, since it uses less digits than its factorization.

99999599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310.

The product of its digits is 23914845, while the sum is 68.

The square root of 99999599 is about 9999.9799499799. The cubic root of 99999599 is about 464.1582629347.

The spelling of 99999599 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred ninety-nine".