91271564 has 12 divisors (see below), whose sum is σ = 164877888. Its totient is φ = 44163600.

The previous prime is 91271561. The next prime is 91271597. The reversal of 91271564 is 46517219.

It is not an unprimeable number, because it can be changed into a prime (91271561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367907 + ... + 368154.

It is an arithmetic number, because the mean of its divisors is an integer number (13739824).

Almost surely, 2^91271564 is an apocalyptic number.

It is an amenable number.

91271564 is a deficient number, since it is larger than the sum of its proper divisors (73606324).

91271564 is a wasteful number, since it uses less digits than its factorization.

91271564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736096 (or 736094 counting only the distinct ones).

The product of its digits is 15120, while the sum is 35.

The square root of 91271564 is about 9553.6152319423. The cubic root of 91271564 is about 450.2411283837.

The spelling of 91271564 in words is "ninety-one million, two hundred seventy-one thousand, five hundred sixty-four".