91317855 has 8 divisors (see below), whose sum is σ = 146108592. Its totient is φ = 48702848.

The previous prime is 91317833. The next prime is 91317859. The reversal of 91317855 is 55871319.

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 91317855 - 2⁵ = 91317823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91317859) 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, 3043914 + ... + 3043943.

It is an arithmetic number, because the mean of its divisors is an integer number (18263574).

Almost surely, 2^91317855 is an apocalyptic number.

91317855 is a deficient number, since it is larger than the sum of its proper divisors (54790737).

91317855 is a wasteful number, since it uses less digits than its factorization.

91317855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6087865.

The product of its digits is 37800, while the sum is 39.

The square root of 91317855 is about 9556.0376202692. The cubic root of 91317855 is about 450.3172331001.

The spelling of 91317855 in words is "ninety-one million, three hundred seventeen thousand, eight hundred fifty-five".