99725931 has 16 divisors (see below), whose sum is σ = 148500000. Its totient is φ = 66142944.

The previous prime is 99725921. The next prime is 99725947. The reversal of 99725931 is 13952799.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-99725931 is a prime.

It is a super-2 number, since 2×99725931² = 19890522627633522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99725921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4056 + ... + 14693.

It is an arithmetic number, because the mean of its divisors is an integer number (9281250).

Almost surely, 2^99725931 is an apocalyptic number.

99725931 is a deficient number, since it is larger than the sum of its proper divisors (48774069).

99725931 is a wasteful number, since it uses less digits than its factorization.

99725931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18955 (or 18949 counting only the distinct ones).

The product of its digits is 153090, while the sum is 45.

The square root of 99725931 is about 9986.2871478843. The cubic root of 99725931 is about 463.7344568476.

The spelling of 99725931 in words is "ninety-nine million, seven hundred twenty-five thousand, nine hundred thirty-one".