12557647 has 2 divisors, whose sum is σ = 12557648. Its totient is φ = 12557646.

The previous prime is 12557641. The next prime is 12557659. The reversal of 12557647 is 74675521.

It is a weak prime.

It is an emirp because it is prime and its reverse (74675521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12557647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12557641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6278823 + 6278824.

It is an arithmetic number, because the mean of its divisors is an integer number (6278824).

Almost surely, 2^12557647 is an apocalyptic number.

12557647 is a deficient number, since it is larger than the sum of its proper divisors (1).

12557647 is an equidigital number, since it uses as much as digits as its factorization.

12557647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58800, while the sum is 37.

The square root of 12557647 is about 3543.6770451044. The cubic root of 12557647 is about 232.4356595388.

The spelling of 12557647 in words is "twelve million, five hundred fifty-seven thousand, six hundred forty-seven".