91317793 has 8 divisors (see below), whose sum is σ = 106074560. Its totient is φ = 76988880.

The previous prime is 91317773. The next prime is 91317823. The reversal of 91317793 is 39771319.

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 91317793 - 2²⁵ = 57763361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91317763) 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, 106503 + ... + 107356.

It is an arithmetic number, because the mean of its divisors is an integer number (13259320).

Almost surely, 2^91317793 is an apocalyptic number.

It is an amenable number.

91317793 is a deficient number, since it is larger than the sum of its proper divisors (14756767).

91317793 is a wasteful number, since it uses less digits than its factorization.

91317793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213927.

The product of its digits is 35721, while the sum is 40.

The square root of 91317793 is about 9556.0343762462. The cubic root of 91317793 is about 450.3171311863.

The spelling of 91317793 in words is "ninety-one million, three hundred seventeen thousand, seven hundred ninety-three".