91597 has 6 divisors (see below), whose sum is σ = 100814. Its totient is φ = 83160.

The previous prime is 91591. The next prime is 91621. The reversal of 91597 is 79519.

91597 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in only one way, i.e., 81796 + 9801 = 286^2 + 99^2 .

It is a de Polignac number, because none of the positive numbers 2^k-91597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 258 + ... + 499.

2⁹¹⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

91597 is a deficient number, since it is larger than the sum of its proper divisors (9217).

91597 is a wasteful number, since it uses less digits than its factorization.

91597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 768 counting only the distinct ones).

The product of its digits is 2835, while the sum is 31.

The square root of 91597 is about 302.6499628283. The cubic root of 91597 is about 45.0775617116.

The spelling of 91597 in words is "ninety-one thousand, five hundred ninety-seven".