91317899 has 8 divisors (see below), whose sum is σ = 93694320. Its totient is φ = 88969216.

The previous prime is 91317893. The next prime is 91317907. The reversal of 91317899 is 99871319.

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 91317899 - 2⁴ = 91317883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91317893) 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, 182 + ... + 13515.

It is an arithmetic number, because the mean of its divisors is an integer number (11711790).

Almost surely, 2^91317899 is an apocalyptic number.

91317899 is a deficient number, since it is larger than the sum of its proper divisors (2376421).

91317899 is a wasteful number, since it uses less digits than its factorization.

91317899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13869.

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

The square root of 91317899 is about 9556.0399224783. The cubic root of 91317899 is about 450.3173054261.

The spelling of 91317899 in words is "ninety-one million, three hundred seventeen thousand, eight hundred ninety-nine".