99279521 has 8 divisors (see below), whose sum is σ = 108518304. Its totient is φ = 90076320.

The previous prime is 99279517. The next prime is 99279533. The reversal of 99279521 is 12597299.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 99279521 - 2² = 99279517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99279511) 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, 2876 + ... + 14381.

It is an arithmetic number, because the mean of its divisors is an integer number (13564788).

Almost surely, 2^99279521 is an apocalyptic number.

99279521 is the 5753-rd octagonal number.

It is an amenable number.

99279521 is a deficient number, since it is larger than the sum of its proper divisors (9238783).

99279521 is a wasteful number, since it uses less digits than its factorization.

99279521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17791.

The product of its digits is 102060, while the sum is 44.

The square root of 99279521 is about 9963.9109289475. The cubic root of 99279521 is about 463.0414730532.

The spelling of 99279521 in words is "ninety-nine million, two hundred seventy-nine thousand, five hundred twenty-one".