91731074112081 has 24 divisors (see below), whose sum is σ = 133471247567840. Its totient is φ = 60706100379456.

The previous prime is 91731074112053. The next prime is 91731074112127. The reversal of 91731074112081 is 18021147013719.

91731074112081 is a `hidden beast` number, since 9 + 17 + 3 + 10 + 7 + 411 + 208 + 1 = 666.

It is not a de Polignac number, because 91731074112081 - 2⁹ = 91731074111569 is a prime.

It is a super-2 number, since 2×91731074112081² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91731074112031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4689165 + ... + 14333541.

Almost surely, 2^{91731074112081} is an apocalyptic number.

It is an amenable number.

91731074112081 is a deficient number, since it is larger than the sum of its proper divisors (41740173455759).

91731074112081 is a wasteful number, since it uses less digits than its factorization.

91731074112081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9652125 (or 9652122 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 45.

The spelling of 91731074112081 in words is "ninety-one trillion, seven hundred thirty-one billion, seventy-four million, one hundred twelve thousand, eighty-one".