91117215 has 108 divisors (see below), whose sum is σ = 194254632. Its totient is φ = 39372480.

The previous prime is 91117207. The next prime is 91117223. The reversal of 91117215 is 51271119.

It is an interprime number because it is at equal distance from previous prime (91117207) and next prime (91117223).

It is not a de Polignac number, because 91117215 - 2³ = 91117207 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 2118984 + ... + 2119026.

It is an arithmetic number, because the mean of its divisors is an integer number (1798654).

Almost surely, 2^91117215 is an apocalyptic number.

91117215 is an abundant number, since it is smaller than the sum of its proper divisors (103137417).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91117215 is a wasteful number, since it uses less digits than its factorization.

91117215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 89 counting only the distinct ones).

The product of its digits is 630, while the sum is 27.

The square root of 91117215 is about 9545.5337723985. The cubic root of 91117215 is about 449.9871848202.

The spelling of 91117215 in words is "ninety-one million, one hundred seventeen thousand, two hundred fifteen".