99217931 has 4 divisors (see below), whose sum is σ = 99237912. Its totient is φ = 99197952.

The previous prime is 99217913. The next prime is 99217957. The reversal of 99217931 is 13971299.

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

It is a cyclic number.

It is not a de Polignac number, because 99217931 - 2²⁶ = 32109067 is a prime.

It is a super-2 number, since 2×99217931² = 19688395663841522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99217901) 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, 3851 + ... + 14603.

It is an arithmetic number, because the mean of its divisors is an integer number (24809478).

Almost surely, 2^99217931 is an apocalyptic number.

99217931 is a deficient number, since it is larger than the sum of its proper divisors (19981).

99217931 is a wasteful number, since it uses less digits than its factorization.

99217931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19980.

The product of its digits is 30618, while the sum is 41.

The square root of 99217931 is about 9960.8197955791. The cubic root of 99217931 is about 462.9457009562.

The spelling of 99217931 in words is "ninety-nine million, two hundred seventeen thousand, nine hundred thirty-one".