12387131 has 4 divisors (see below), whose sum is σ = 12439200. Its totient is φ = 12335064.

The previous prime is 12387127. The next prime is 12387149. The reversal of 12387131 is 13178321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13178321 = 13 ⋅1013717.

It is a cyclic number.

It is not a de Polignac number, because 12387131 - 2² = 12387127 is a prime.

It is a super-2 number, since 2×12387131² = 306882028822322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12387131.

It is not an unprimeable number, because it can be changed into a prime (12386131) 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 3 ways as a sum of consecutive naturals, for example, 25676 + ... + 26153.

It is an arithmetic number, because the mean of its divisors is an integer number (3109800).

Almost surely, 2^12387131 is an apocalyptic number.

12387131 is a deficient number, since it is larger than the sum of its proper divisors (52069).

12387131 is an equidigital number, since it uses as much as digits as its factorization.

12387131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52068.

The product of its digits is 1008, while the sum is 26.

The square root of 12387131 is about 3519.5356227775. The cubic root of 12387131 is about 231.3788066439.

The spelling of 12387131 in words is "twelve million, three hundred eighty-seven thousand, one hundred thirty-one".