99509031 has 12 divisors (see below), whose sum is σ = 145351440. Its totient is φ = 65593440.

The previous prime is 99508999. The next prime is 99509057. The reversal of 99509031 is 13090599.

It is not a de Polignac number, because 99509031 - 2⁵ = 99508999 is a prime.

It is a super-2 number, since 2×99509031² = 19804094501117922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99509071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61315 + ... + 62916.

It is an arithmetic number, because the mean of its divisors is an integer number (12112620).

Almost surely, 2^99509031 is an apocalyptic number.

99509031 is a deficient number, since it is larger than the sum of its proper divisors (45842409).

99509031 is a wasteful number, since it uses less digits than its factorization.

99509031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124326 (or 124323 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 99509031 is about 9975.4213444847. The cubic root of 99509031 is about 463.3980113748.

It can be divided in two parts, 9950 and 9031, that added together give a palindrome (18981).

The spelling of 99509031 in words is "ninety-nine million, five hundred nine thousand, thirty-one".