12091081110991 has 4 divisors (see below), whose sum is σ = 12171154495984. Its totient is φ = 12011007726000.

The previous prime is 12091081110971. The next prime is 12091081111003. The reversal of 12091081110991 is 19901118019021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12091081110991 - 2⁷ = 12091081110863 is a prime.

It is a super-2 number, since 2×12091081110991² (a number of 27 digits) 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 (12091081110971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40036692270 + ... + 40036692571.

It is an arithmetic number, because the mean of its divisors is an integer number (3042788623996).

Almost surely, 2^{12091081110991} is an apocalyptic number.

12091081110991 is a deficient number, since it is larger than the sum of its proper divisors (80073384993).

12091081110991 is an equidigital number, since it uses as much as digits as its factorization.

12091081110991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80073384992.

The product of its (nonzero) digits is 11664, while the sum is 43.

The spelling of 12091081110991 in words is "twelve trillion, ninety-one billion, eighty-one million, one hundred ten thousand, nine hundred ninety-one".