12131312 has 20 divisors (see below), whose sum is σ = 23740296. Its totient is φ = 6004800.

The previous prime is 12131303. The next prime is 12131321. The reversal of 12131312 is 21313121.

It is an interprime number because it is at equal distance from previous prime (12131303) and next prime (12131321).

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2138 + ... + 5369.

Almost surely, 2^12131312 is an apocalyptic number.

It is an amenable number.

12131312 is a deficient number, since it is larger than the sum of its proper divisors (11608984).

12131312 is a wasteful number, since it uses less digits than its factorization.

12131312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7616 (or 7610 counting only the distinct ones).

The product of its digits is 36, while the sum is 14.

The square root of 12131312 is about 3483.0033017498. The cubic root of 12131312 is about 229.7749026460.

Adding to 12131312 its reverse (21313121), we get a palindrome (33444433).

The spelling of 12131312 in words is "twelve million, one hundred thirty-one thousand, three hundred twelve".