12131311331 has 16 divisors (see below), whose sum is σ = 12395325600. Its totient is φ = 11870281728.

The previous prime is 12131311327. The next prime is 12131311393. The reversal of 12131311331 is 13311313121.

It is a cyclic number.

It is not a de Polignac number, because 12131311331 - 2² = 12131311327 is a prime.

It is a super-2 number, since 2×12131311331² (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 (12131311321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7538855 + ... + 7540463.

It is an arithmetic number, because the mean of its divisors is an integer number (774707850).

Almost surely, 2^12131311331 is an apocalyptic number.

12131311331 is a deficient number, since it is larger than the sum of its proper divisors (264014269).

12131311331 is a wasteful number, since it uses less digits than its factorization.

12131311331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2438.

The product of its digits is 162, while the sum is 20.

Adding to 12131311331 its reverse (13311313121), we get a palindrome (25442624452).

The spelling of 12131311331 in words is "twelve billion, one hundred thirty-one million, three hundred eleven thousand, three hundred thirty-one".