91281372092 has 12 divisors (see below), whose sum is σ = 169139013120. Its totient is φ = 42955939776.

The previous prime is 91281372071. The next prime is 91281372137. The reversal of 91281372092 is 29027318219.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 671186492 + ... + 671186627.

It is an arithmetic number, because the mean of its divisors is an integer number (14094917760).

Almost surely, 2^91281372092 is an apocalyptic number.

It is an amenable number.

91281372092 is a deficient number, since it is larger than the sum of its proper divisors (77857641028).

91281372092 is a wasteful number, since it uses less digits than its factorization.

91281372092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342373140 (or 1342373138 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 91281372092 in words is "ninety-one billion, two hundred eighty-one million, three hundred seventy-two thousand, ninety-two".