91315917 has 60 divisors (see below), whose sum is σ = 171487008. Its totient is φ = 47436840.

The previous prime is 91315901. The next prime is 91315933. The reversal of 91315917 is 71951319.

It is an interprime number because it is at equal distance from previous prime (91315901) and next prime (91315933).

It is not a de Polignac number, because 91315917 - 2⁴ = 91315901 is a prime.

Its product of digits (8505) is a multiple of the sum of its prime divisors (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91315417) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 8301442 + ... + 8301452.

Almost surely, 2^91315917 is an apocalyptic number.

It is an amenable number.

91315917 is a deficient number, since it is larger than the sum of its proper divisors (80171091).

91315917 is an frugal number, since it uses more digits than its factorization.

91315917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 21 counting only the distinct ones).

The product of its digits is 8505, while the sum is 36.

The square root of 91315917 is about 9555.9362178700. The cubic root of 91315917 is about 450.3140474472.

The spelling of 91315917 in words is "ninety-one million, three hundred fifteen thousand, nine hundred seventeen".