99121309 has 8 divisors (see below), whose sum is σ = 119243840. Its totient is φ = 80489376.

The previous prime is 99121307. The next prime is 99121343. The reversal of 99121309 is 90312199.

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 99121309 - 2¹ = 99121307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99121307) 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, 372504 + ... + 372769.

It is an arithmetic number, because the mean of its divisors is an integer number (14905480).

Almost surely, 2^99121309 is an apocalyptic number.

It is an amenable number.

99121309 is a deficient number, since it is larger than the sum of its proper divisors (20122531).

99121309 is a wasteful number, since it uses less digits than its factorization.

99121309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745299.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 99121309 is about 9955.9685114006. The cubic root of 99121309 is about 462.7953744072.

The spelling of 99121309 in words is "ninety-nine million, one hundred twenty-one thousand, three hundred nine".