12147391 has 2 divisors, whose sum is σ = 12147392. Its totient is φ = 12147390.

The previous prime is 12147383. The next prime is 12147397. The reversal of 12147391 is 19374121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12147391 - 2³ = 12147383 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12147397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6073695 + 6073696.

It is an arithmetic number, because the mean of its divisors is an integer number (6073696).

Almost surely, 2^12147391 is an apocalyptic number.

12147391 is a deficient number, since it is larger than the sum of its proper divisors (1).

12147391 is an equidigital number, since it uses as much as digits as its factorization.

12147391 is an evil number, because the sum of its binary digits is even.

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

The square root of 12147391 is about 3485.3107465476. The cubic root of 12147391 is about 229.8763733853.

The spelling of 12147391 in words is "twelve million, one hundred forty-seven thousand, three hundred ninety-one".