99715531 has 4 divisors (see below), whose sum is σ = 100151200. Its totient is φ = 99279864.

The previous prime is 99715519. The next prime is 99715537. The reversal of 99715531 is 13551799.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99715531 is a prime.

It is a super-2 number, since 2×99715531² = 19886374245223922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99715537) 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, 217491 + ... + 217948.

It is an arithmetic number, because the mean of its divisors is an integer number (25037800).

Almost surely, 2^99715531 is an apocalyptic number.

99715531 is a deficient number, since it is larger than the sum of its proper divisors (435669).

99715531 is a wasteful number, since it uses less digits than its factorization.

99715531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435668.

The product of its digits is 42525, while the sum is 40.

The square root of 99715531 is about 9985.7664202604. The cubic root of 99715531 is about 463.7183359786.

The spelling of 99715531 in words is "ninety-nine million, seven hundred fifteen thousand, five hundred thirty-one".