91713581 has 8 divisors (see below), whose sum is σ = 96581760. Its totient is φ = 86918832.

The previous prime is 91713577. The next prime is 91713617. The reversal of 91713581 is 18531719.

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 91713581 - 2² = 91713577 is a prime.

It is a super-2 number, since 2×91713581² = 16822761879687122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91713511) 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, 15785 + ... + 20798.

It is an arithmetic number, because the mean of its divisors is an integer number (12072720).

Almost surely, 2^91713581 is an apocalyptic number.

It is an amenable number.

91713581 is a deficient number, since it is larger than the sum of its proper divisors (4868179).

91713581 is a wasteful number, since it uses less digits than its factorization.

91713581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36715.

The product of its digits is 7560, while the sum is 35.

The square root of 91713581 is about 9576.7207853210. The cubic root of 91713581 is about 450.9667790995.

The spelling of 91713581 in words is "ninety-one million, seven hundred thirteen thousand, five hundred eighty-one".