12147139 has 2 divisors, whose sum is σ = 12147140. Its totient is φ = 12147138.

The previous prime is 12147131. The next prime is 12147173. The reversal of 12147139 is 93174121.

12147139 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (93174121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12147139 - 2³ = 12147131 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12147131) 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 as a sum of consecutive naturals, namely, 6073569 + 6073570.

It is an arithmetic number, because the mean of its divisors is an integer number (6073570).

Almost surely, 2^12147139 is an apocalyptic number.

12147139 is a deficient number, since it is larger than the sum of its proper divisors (1).

12147139 is an equidigital number, since it uses as much as digits as its factorization.

12147139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 12147139 is about 3485.2745946338. The cubic root of 12147139 is about 229.8747837642.

The spelling of 12147139 in words is "twelve million, one hundred forty-seven thousand, one hundred thirty-nine".