99799121 has 8 divisors (see below), whose sum is σ = 103458600. Its totient is φ = 96154240.

The previous prime is 99799109. The next prime is 99799127. The reversal of 99799121 is 12199799.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 44742721 + 55056400 = 6689^2 + 7420^2 .

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 99799121 - 2²⁶ = 32690257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99799127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11381 + ... + 18141.

It is an arithmetic number, because the mean of its divisors is an integer number (12932325).

Almost surely, 2^99799121 is an apocalyptic number.

It is an amenable number.

99799121 is a deficient number, since it is larger than the sum of its proper divisors (3659479).

99799121 is a wasteful number, since it uses less digits than its factorization.

99799121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7299.

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

The square root of 99799121 is about 9989.9510008808. The cubic root of 99799121 is about 463.8478757775.

The spelling of 99799121 in words is "ninety-nine million, seven hundred ninety-nine thousand, one hundred twenty-one".