99261531 has 20 divisors (see below), whose sum is σ = 150319752. Its totient is φ = 65263968.

The previous prime is 99261499. The next prime is 99261551. The reversal of 99261531 is 13516299.

99261531 is a `hidden beast` number, since 9 + 9 + 2 + 615 + 31 = 666.

It is not a de Polignac number, because 99261531 - 2⁵ = 99261499 is a prime.

It is a super-2 number, since 2×99261531² = 19705703072927922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99261551) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2481 + ... + 14306.

Almost surely, 2^99261531 is an apocalyptic number.

99261531 is a deficient number, since it is larger than the sum of its proper divisors (51058221).

99261531 is a wasteful number, since it uses less digits than its factorization.

99261531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16872 (or 16863 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 99261531 is about 9963.0081300780. The cubic root of 99261531 is about 463.0135028024.

The spelling of 99261531 in words is "ninety-nine million, two hundred sixty-one thousand, five hundred thirty-one".