91579686731 has 8 divisors (see below), whose sum is σ = 100722667584. Its totient is φ = 82736475840.

The previous prime is 91579686727. The next prime is 91579686767. The reversal of 91579686731 is 13768697519.

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 91579686731 - 2² = 91579686727 is a prime.

It is a super-2 number, since 2×91579686731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91579686721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74941850 + ... + 74943071.

It is an arithmetic number, because the mean of its divisors is an integer number (12590333448).

Almost surely, 2^91579686731 is an apocalyptic number.

91579686731 is a deficient number, since it is larger than the sum of its proper divisors (9142980853).

91579686731 is a wasteful number, since it uses less digits than its factorization.

91579686731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149884981.

The product of its digits is 17146080, while the sum is 62.

The spelling of 91579686731 in words is "ninety-one billion, five hundred seventy-nine million, six hundred eighty-six thousand, seven hundred thirty-one".