91131616 has 12 divisors (see below), whose sum is σ = 179415432. Its totient is φ = 45565792.

The previous prime is 91131587. The next prime is 91131641. The reversal of 91131616 is 61613119.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1423900 + ... + 1423963.

It is an arithmetic number, because the mean of its divisors is an integer number (14951286).

Almost surely, 2^91131616 is an apocalyptic number.

It is an amenable number.

91131616 is a deficient number, since it is larger than the sum of its proper divisors (88283816).

91131616 is a wasteful number, since it uses less digits than its factorization.

91131616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847873 (or 2847865 counting only the distinct ones).

The product of its digits is 972, while the sum is 28.

The square root of 91131616 is about 9546.2880744298. The cubic root of 91131616 is about 450.0108902714.

The spelling of 91131616 in words is "ninety-one million, one hundred thirty-one thousand, six hundred sixteen".