91161693 has 24 divisors (see below), whose sum is σ = 156065728. Its totient is φ = 52091424.

The previous prime is 91161683. The next prime is 91161709. The reversal of 91161693 is 39616119.

It is not a de Polignac number, because 91161693 - 2⁸ = 91161437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91161683) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25096 + ... + 28497.

Almost surely, 2^91161693 is an apocalyptic number.

It is an amenable number.

91161693 is a deficient number, since it is larger than the sum of its proper divisors (64904035).

91161693 is an equidigital number, since it uses as much as digits as its factorization.

91161693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53615 (or 53603 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 91161693 is about 9547.8632688157. The cubic root of 91161693 is about 450.0603918948.

The spelling of 91161693 in words is "ninety-one million, one hundred sixty-one thousand, six hundred ninety-three".