99238431 has 4 divisors (see below), whose sum is σ = 132317912. Its totient is φ = 66158952.

The previous prime is 99238427. The next prime is 99238439. The reversal of 99238431 is 13483299.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 99238431 - 2² = 99238427 is a prime.

It is a super-2 number, since 2×99238431² = 19696532374683522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99238431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99238439) 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, 16539736 + ... + 16539741.

It is an arithmetic number, because the mean of its divisors is an integer number (33079478).

Almost surely, 2^99238431 is an apocalyptic number.

99238431 is a deficient number, since it is larger than the sum of its proper divisors (33079481).

99238431 is a wasteful number, since it uses less digits than its factorization.

99238431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33079480.

The product of its digits is 46656, while the sum is 39.

The square root of 99238431 is about 9961.8487741985. The cubic root of 99238431 is about 462.9775827382.

The spelling of 99238431 in words is "ninety-nine million, two hundred thirty-eight thousand, four hundred thirty-one".