91115693 has 4 divisors (see below), whose sum is σ = 91176288. Its totient is φ = 91055100.

The previous prime is 91115683. The next prime is 91115711. The reversal of 91115693 is 39651119.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39651119 = 19 ⋅2086901.

It is a cyclic number.

It is not a de Polignac number, because 91115693 - 2¹² = 91111597 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 (91115623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27983 + ... + 31068.

It is an arithmetic number, because the mean of its divisors is an integer number (22794072).

Almost surely, 2^91115693 is an apocalyptic number.

It is an amenable number.

91115693 is a deficient number, since it is larger than the sum of its proper divisors (60595).

91115693 is a wasteful number, since it uses less digits than its factorization.

91115693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60594.

The product of its digits is 7290, while the sum is 35.

The square root of 91115693 is about 9545.4540489177. The cubic root of 91115693 is about 449.9846793138.

The spelling of 91115693 in words is "ninety-one million, one hundred fifteen thousand, six hundred ninety-three".