12131111131 has 4 divisors (see below), whose sum is σ = 12134738952. Its totient is φ = 12127483312.

The previous prime is 12131111123. The next prime is 12131111143. The reversal of 12131111131 is 13111113121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13111113121 = 29 ⋅452107349.

It is a cyclic number.

It is not a de Polignac number, because 12131111131 - 2³ = 12131111123 is a prime.

It is a super-2 number, since 2×12131111131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12131111101) 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, 1808890 + ... + 1815583.

It is an arithmetic number, because the mean of its divisors is an integer number (3033684738).

Almost surely, 2^12131111131 is an apocalyptic number.

12131111131 is a deficient number, since it is larger than the sum of its proper divisors (3627821).

12131111131 is an equidigital number, since it uses as much as digits as its factorization.

12131111131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627820.

The product of its digits is 18, while the sum is 16.

Adding to 12131111131 its reverse (13111113121), we get a palindrome (25242224252).

The spelling of 12131111131 in words is "twelve billion, one hundred thirty-one million, one hundred eleven thousand, one hundred thirty-one".