99999913 has 4 divisors (see below), whose sum is σ = 107692228. Its totient is φ = 92307600.

The previous prime is 99999847. The next prime is 99999931. The reversal of 99999913 is 31999999.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46826649 + 53173264 = 6843^2 + 7292^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999913 - 2⁹ = 99999401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99999113) 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, 3846138 + ... + 3846163.

It is an arithmetic number, because the mean of its divisors is an integer number (26923057).

Almost surely, 2^99999913 is an apocalyptic number.

It is an amenable number.

99999913 is a deficient number, since it is larger than the sum of its proper divisors (7692315).

99999913 is a wasteful number, since it uses less digits than its factorization.

99999913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7692314.

The product of its digits is 1594323, while the sum is 58.

The square root of 99999913 is about 9999.9956499991. The cubic root of 99999913 is about 464.1587487552.

The spelling of 99999913 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred thirteen".