13111231212091 has 4 divisors (see below), whose sum is σ = 13130205498184. Its totient is φ = 13092256926000.

The previous prime is 13111231212041. The next prime is 13111231212109. The reversal of 13111231212091 is 19021213211131.

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 13111231212091 - 2¹¹ = 13111231210043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13111231212041) 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, 9487142010 + ... + 9487143391.

It is an arithmetic number, because the mean of its divisors is an integer number (3282551374546).

Almost surely, 2^{13111231212091} is an apocalyptic number.

13111231212091 is a deficient number, since it is larger than the sum of its proper divisors (18974286093).

13111231212091 is an equidigital number, since it uses as much as digits as its factorization.

13111231212091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18974286092.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 13111231212091 in words is "thirteen trillion, one hundred eleven billion, two hundred thirty-one million, two hundred twelve thousand, ninety-one".