99931817 has 8 divisors (see below), whose sum is σ = 104570880. Its totient is φ = 95381280.

The previous prime is 99931813. The next prime is 99931837. The reversal of 99931817 is 71813999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99931817 - 2² = 99931813 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99931813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19817 + ... + 24342.

It is an arithmetic number, because the mean of its divisors is an integer number (13071360).

Almost surely, 2^99931817 is an apocalyptic number.

It is an amenable number.

99931817 is a deficient number, since it is larger than the sum of its proper divisors (4639063).

99931817 is a wasteful number, since it uses less digits than its factorization.

99931817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44263.

The product of its digits is 122472, while the sum is 47.

The square root of 99931817 is about 9996.5902686866. The cubic root of 99931817 is about 464.0533668924.

The spelling of 99931817 in words is "ninety-nine million, nine hundred thirty-one thousand, eight hundred seventeen".