99679521 has 4 divisors (see below), whose sum is σ = 132906032. Its totient is φ = 66453012.

The previous prime is 99679511. The next prime is 99679561. The reversal of 99679521 is 12597699.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 99679521 - 2⁹ = 99679009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99679501) 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, 16613251 + ... + 16613256.

It is an arithmetic number, because the mean of its divisors is an integer number (33226508).

Almost surely, 2^99679521 is an apocalyptic number.

It is an amenable number.

99679521 is a deficient number, since it is larger than the sum of its proper divisors (33226511).

99679521 is a wasteful number, since it uses less digits than its factorization.

99679521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33226510.

The product of its digits is 306180, while the sum is 48.

The square root of 99679521 is about 9983.9631910379. The cubic root of 99679521 is about 463.6625088084.

The spelling of 99679521 in words is "ninety-nine million, six hundred seventy-nine thousand, five hundred twenty-one".