91917816 has 32 divisors (see below), whose sum is σ = 231834960. Its totient is φ = 30367232.

The previous prime is 91917809. The next prime is 91917817. The reversal of 91917816 is 61871919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91917817) 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, 14235 + ... + 19658.

Almost surely, 2^91917816 is an apocalyptic number.

It is an amenable number.

91917816 is an abundant number, since it is smaller than the sum of its proper divisors (139917144).

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

91917816 is a wasteful number, since it uses less digits than its factorization.

91917816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34015 (or 34011 counting only the distinct ones).

The product of its digits is 27216, while the sum is 42.

The square root of 91917816 is about 9587.3779522871. The cubic root of 91917816 is about 451.3012803298.

The spelling of 91917816 in words is "ninety-one million, nine hundred seventeen thousand, eight hundred sixteen".