99179921 has 8 divisors (see below), whose sum is σ = 105178464. Its totient is φ = 93199680.

The previous prime is 99179911. The next prime is 99179923. The reversal of 99179921 is 12997199.

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 99179921 - 2¹⁰ = 99178897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99179923) 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, 7526 + ... + 15968.

It is an arithmetic number, because the mean of its divisors is an integer number (13147308).

Almost surely, 2^99179921 is an apocalyptic number.

It is an amenable number.

99179921 is a deficient number, since it is larger than the sum of its proper divisors (5998543).

99179921 is a wasteful number, since it uses less digits than its factorization.

99179921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9151.

The product of its digits is 91854, while the sum is 47.

The square root of 99179921 is about 9958.9116373226. The cubic root of 99179921 is about 462.8865758450.

The spelling of 99179921 in words is "ninety-nine million, one hundred seventy-nine thousand, nine hundred twenty-one".