13112111231 has 4 divisors (see below), whose sum is σ = 13431918864. Its totient is φ = 12792303600.

The previous prime is 13112111219. The next prime is 13112111249. The reversal of 13112111231 is 13211121131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13211121131 = 13 ⋅1016240087.

It is a cyclic number.

It is not a de Polignac number, because 13112111231 - 2⁶ = 13112111167 is a prime.

It is a super-2 number, since 2×13112111231² (a number of 21 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 (13112101231) by changing a digit.

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, 159903755 + ... + 159903836.

It is an arithmetic number, because the mean of its divisors is an integer number (3357979716).

Almost surely, 2^13112111231 is an apocalyptic number.

13112111231 is a deficient number, since it is larger than the sum of its proper divisors (319807633).

13112111231 is an equidigital number, since it uses as much as digits as its factorization.

13112111231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319807632.

The product of its digits is 36, while the sum is 17.

Adding to 13112111231 its reverse (13211121131), we get a palindrome (26323232362).

The spelling of 13112111231 in words is "thirteen billion, one hundred twelve million, one hundred eleven thousand, two hundred thirty-one".