99321931 has 4 divisors (see below), whose sum is σ = 99931432. Its totient is φ = 98712432.

The previous prime is 99321919. The next prime is 99321983. The reversal of 99321931 is 13912399.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13912399 = 983 ⋅14153.

It is a cyclic number.

It is not a de Polignac number, because 99321931 - 2²¹ = 97224779 is a prime.

It is a super-2 number, since 2×99321931² = 19729691955137522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99321991) 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, 304506 + ... + 304831.

It is an arithmetic number, because the mean of its divisors is an integer number (24982858).

Almost surely, 2^99321931 is an apocalyptic number.

99321931 is a deficient number, since it is larger than the sum of its proper divisors (609501).

99321931 is a wasteful number, since it uses less digits than its factorization.

99321931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609500.

The product of its digits is 13122, while the sum is 37.

The square root of 99321931 is about 9966.0388821236. The cubic root of 99321931 is about 463.1073973348.

The spelling of 99321931 in words is "ninety-nine million, three hundred twenty-one thousand, nine hundred thirty-one".