91631564 has 24 divisors (see below), whose sum is σ = 170825760. Its totient is φ = 42857216.

The previous prime is 91631531. The next prime is 91631569. The reversal of 91631564 is 46513619.

It is not an unprimeable number, because it can be changed into a prime (91631569) 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, 7322 + ... + 15390.

It is an arithmetic number, because the mean of its divisors is an integer number (7117740).

Almost surely, 2^91631564 is an apocalyptic number.

It is an amenable number.

91631564 is a deficient number, since it is larger than the sum of its proper divisors (79194196).

91631564 is a wasteful number, since it uses less digits than its factorization.

91631564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8257 (or 8255 counting only the distinct ones).

The product of its digits is 19440, while the sum is 35.

The square root of 91631564 is about 9572.4377250521. The cubic root of 91631564 is about 450.8323098352.

The spelling of 91631564 in words is "ninety-one million, six hundred thirty-one thousand, five hundred sixty-four".