12131239 has 4 divisors (see below), whose sum is σ = 12192400. Its totient is φ = 12070080.

The previous prime is 12131219. The next prime is 12131257. The reversal of 12131239 is 93213121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93213121 = 43 ⋅2167747.

It is a cyclic number.

It is not a de Polignac number, because 12131239 - 2²³ = 3742631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131219) 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, 30282 + ... + 30679.

It is an arithmetic number, because the mean of its divisors is an integer number (3048100).

Almost surely, 2^12131239 is an apocalyptic number.

12131239 is a deficient number, since it is larger than the sum of its proper divisors (61161).

12131239 is an equidigital number, since it uses as much as digits as its factorization.

12131239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61160.

The product of its digits is 324, while the sum is 22.

The square root of 12131239 is about 3482.9928222722. The cubic root of 12131239 is about 229.7744417560.

The spelling of 12131239 in words is "twelve million, one hundred thirty-one thousand, two hundred thirty-nine".