12564191 has 4 divisors (see below), whose sum is σ = 12575112. Its totient is φ = 12553272.

The previous prime is 12564169. The next prime is 12564193. The reversal of 12564191 is 19146521.

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.

It is a cyclic number.

It is not a de Polignac number, because 12564191 - 2¹⁰ = 12563167 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3500 + ... + 6113.

It is an arithmetic number, because the mean of its divisors is an integer number (3143778).

Almost surely, 2^12564191 is an apocalyptic number.

12564191 is a deficient number, since it is larger than the sum of its proper divisors (10921).

12564191 is an equidigital number, since it uses as much as digits as its factorization.

12564191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10920.

The product of its digits is 2160, while the sum is 29.

The square root of 12564191 is about 3544.6002595497. The cubic root of 12564191 is about 232.4760278980.

The spelling of 12564191 in words is "twelve million, five hundred sixty-four thousand, one hundred ninety-one".