91131672 has 32 divisors (see below), whose sum is σ = 228656880. Its totient is φ = 30266880.

The previous prime is 91131653. The next prime is 91131673. The reversal of 91131672 is 27613119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91131673) 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, 13 + ... + 13500.

Almost surely, 2^91131672 is an apocalyptic number.

It is an amenable number.

91131672 is an abundant number, since it is smaller than the sum of its proper divisors (137525208).

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

91131672 is a wasteful number, since it uses less digits than its factorization.

91131672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13803 (or 13799 counting only the distinct ones).

The product of its digits is 2268, while the sum is 30.

The square root of 91131672 is about 9546.2910075065. The cubic root of 91131672 is about 450.0109824480.

The spelling of 91131672 in words is "ninety-one million, one hundred thirty-one thousand, six hundred seventy-two".