91297109212 has 12 divisors (see below), whose sum is σ = 159855805816. Its totient is φ = 45624021840.

The previous prime is 91297109173. The next prime is 91297109221. The reversal of 91297109212 is 21290179219.

It is a hoax number, since the sum of its digits (43) 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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6124818 + ... + 6139705.

Almost surely, 2^91297109212 is an apocalyptic number.

It is an amenable number.

91297109212 is a deficient number, since it is larger than the sum of its proper divisors (68558696604).

91297109212 is a wasteful number, since it uses less digits than its factorization.

91297109212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12266388 (or 12266386 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 91297109212 in words is "ninety-one billion, two hundred ninety-seven million, one hundred nine thousand, two hundred twelve".