12031139 has 4 divisors (see below), whose sum is σ = 12554256. Its totient is φ = 11508024.

The previous prime is 12031133. The next prime is 12031141. The reversal of 12031139 is 93113021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12031139 - 2²⁰ = 10982563 is a prime.

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 12031139.

It is not an unprimeable number, because it can be changed into a prime (12031133) 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, 261524 + ... + 261569.

It is an arithmetic number, because the mean of its divisors is an integer number (3138564).

Almost surely, 2^12031139 is an apocalyptic number.

12031139 is a deficient number, since it is larger than the sum of its proper divisors (523117).

12031139 is an equidigital number, since it uses as much as digits as its factorization.

12031139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523116.

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

The square root of 12031139 is about 3468.5932306917. The cubic root of 12031139 is about 229.1407066719.

The spelling of 12031139 in words is "twelve million, thirty-one thousand, one hundred thirty-nine".