12556147 has 4 divisors (see below), whose sum is σ = 12961216. Its totient is φ = 12151080.

The previous prime is 12556139. The next prime is 12556153. The reversal of 12556147 is 74165521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74165521 = 97 ⋅764593.

It is a cyclic number.

It is not a de Polignac number, because 12556147 - 2³ = 12556139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 405037 = 12556147 / (1 + 2 + 5 + 5 + 6 + 1 + 4 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12556547) 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 in 3 ways as a sum of consecutive naturals, for example, 202488 + ... + 202549.

It is an arithmetic number, because the mean of its divisors is an integer number (3240304).

Almost surely, 2^12556147 is an apocalyptic number.

12556147 is a deficient number, since it is larger than the sum of its proper divisors (405069).

12556147 is an equidigital number, since it uses as much as digits as its factorization.

12556147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405068.

The product of its digits is 8400, while the sum is 31.

The square root of 12556147 is about 3543.4653942151. The cubic root of 12556147 is about 232.4264044245.

The spelling of 12556147 in words is "twelve million, five hundred fifty-six thousand, one hundred forty-seven".