99979913 has 8 divisors (see below), whose sum is σ = 109680480. Its totient is φ = 90381280.

The previous prime is 99979903. The next prime is 99979927. The reversal of 99979913 is 31997999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99979913 - 2⁸ = 99979657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99979903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23420 + ... + 27357.

It is an arithmetic number, because the mean of its divisors is an integer number (13710060).

Almost surely, 2^99979913 is an apocalyptic number.

It is an amenable number.

99979913 is a deficient number, since it is larger than the sum of its proper divisors (9700567).

99979913 is a wasteful number, since it uses less digits than its factorization.

99979913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50967.

The product of its digits is 1240029, while the sum is 56.

The square root of 99979913 is about 9998.9955995590. The cubic root of 99979913 is about 464.1278027485.

The spelling of 99979913 in words is "ninety-nine million, nine hundred seventy-nine thousand, nine hundred thirteen".