12131354431 has 4 divisors (see below), whose sum is σ = 13864405072. Its totient is φ = 10398303792.

The previous prime is 12131354423. The next prime is 12131354453. The reversal of 12131354431 is 13445313121.

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 12131354431 - 2³ = 12131354423 is a prime.

It is a super-2 number, since 2×12131354431² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12131354431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131354461) 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, 866525310 + ... + 866525323.

It is an arithmetic number, because the mean of its divisors is an integer number (3466101268).

Almost surely, 2^12131354431 is an apocalyptic number.

12131354431 is a deficient number, since it is larger than the sum of its proper divisors (1733050641).

12131354431 is an equidigital number, since it uses as much as digits as its factorization.

12131354431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733050640.

The product of its digits is 4320, while the sum is 28.

Adding to 12131354431 its reverse (13445313121), we get a palindrome (25576667552).

The spelling of 12131354431 in words is "twelve billion, one hundred thirty-one million, three hundred fifty-four thousand, four hundred thirty-one".