91631136 has 24 divisors (see below), whose sum is σ = 240531984. Its totient is φ = 30543680.

The previous prime is 91631131. The next prime is 91631159. The reversal of 91631136 is 63113619.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-3 number, since 3×91631136³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (91631131) 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, 477150 + ... + 477341.

It is an arithmetic number, because the mean of its divisors is an integer number (10022166).

Almost surely, 2^91631136 is an apocalyptic number.

91631136 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

91631136 is an abundant number, since it is smaller than the sum of its proper divisors (148900848).

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

91631136 is a wasteful number, since it uses less digits than its factorization.

91631136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954504 (or 954496 counting only the distinct ones).

The product of its digits is 2916, while the sum is 30.

The square root of 91631136 is about 9572.4153691741. The cubic root of 91631136 is about 450.8316079063.

The spelling of 91631136 in words is "ninety-one million, six hundred thirty-one thousand, one hundred thirty-six".