12013312131 has 6 divisors (see below), whose sum is σ = 17352561980. Its totient is φ = 8008874748.

The previous prime is 12013312127. The next prime is 12013312139. The reversal of 12013312131 is 13121331021.

12013312131 is a `hidden beast` number, since 1 + 201 + 331 + 2 + 131 = 666.

It is not a de Polignac number, because 12013312131 - 2² = 12013312127 is a prime.

It is a super-2 number, since 2×12013312131² (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 (12013312139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 667406221 + ... + 667406238.

Almost surely, 2^12013312131 is an apocalyptic number.

12013312131 is a deficient number, since it is larger than the sum of its proper divisors (5339249849).

12013312131 is a wasteful number, since it uses less digits than its factorization.

12013312131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334812465 (or 1334812462 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 12013312131 its reverse (13121331021), we get a palindrome (25134643152).

The spelling of 12013312131 in words is "twelve billion, thirteen million, three hundred twelve thousand, one hundred thirty-one".