12564197 has 4 divisors (see below), whose sum is σ = 12572076. Its totient is φ = 12556320.

The previous prime is 12564193. The next prime is 12564247. The reversal of 12564197 is 79146521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 79146521 = 857 ⋅92353.

It can be written as a sum of positive squares in 2 ways, for example, as 4532641 + 8031556 = 2129^2 + 2834^2 .

It is a cyclic number.

It is not a de Polignac number, because 12564197 - 2² = 12564193 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12564193) 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, 608 + ... + 5049.

It is an arithmetic number, because the mean of its divisors is an integer number (3143019).

Almost surely, 2^12564197 is an apocalyptic number.

It is an amenable number.

12564197 is a deficient number, since it is larger than the sum of its proper divisors (7879).

12564197 is an equidigital number, since it uses as much as digits as its factorization.

12564197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7878.

The product of its digits is 15120, while the sum is 35.

The square root of 12564197 is about 3544.6011059074. The cubic root of 12564197 is about 232.4760649041.

The spelling of 12564197 in words is "twelve million, five hundred sixty-four thousand, one hundred ninety-seven".