91691365 has 8 divisors (see below), whose sum is σ = 113003640. Its totient is φ = 71370432.

The previous prime is 91691339. The next prime is 91691377. The reversal of 91691365 is 56319619.

It can be written as a sum of positive squares in 4 ways, for example, as 13704804 + 77986561 = 3702^2 + 8831^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91691365 - 2¹⁵ = 91658597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247630 + ... + 247999.

It is an arithmetic number, because the mean of its divisors is an integer number (14125455).

Almost surely, 2^91691365 is an apocalyptic number.

It is an amenable number.

91691365 is a deficient number, since it is larger than the sum of its proper divisors (21312275).

91691365 is a wasteful number, since it uses less digits than its factorization.

91691365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495671.

The product of its digits is 43740, while the sum is 40.

The square root of 91691365 is about 9575.5608190852. The cubic root of 91691365 is about 450.9303632386.

The spelling of 91691365 in words is "ninety-one million, six hundred ninety-one thousand, three hundred sixty-five".