99121983 has 4 divisors (see below), whose sum is σ = 132162648. Its totient is φ = 66081320.

The previous prime is 99121961. The next prime is 99121991. The reversal of 99121983 is 38912199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38912199 = 3 ⋅12970733.

It is a cyclic number.

It is not a de Polignac number, because 99121983 - 2⁹ = 99121471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99121783) 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, 16520328 + ... + 16520333.

It is an arithmetic number, because the mean of its divisors is an integer number (33040662).

Almost surely, 2^99121983 is an apocalyptic number.

99121983 is a deficient number, since it is larger than the sum of its proper divisors (33040665).

99121983 is a wasteful number, since it uses less digits than its factorization.

99121983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33040664.

The product of its digits is 34992, while the sum is 42.

The square root of 99121983 is about 9956.0023603854. The cubic root of 99121983 is about 462.7964233689.

The spelling of 99121983 in words is "ninety-nine million, one hundred twenty-one thousand, nine hundred eighty-three".