12564557 has 8 divisors (see below), whose sum is σ = 13132416. Its totient is φ = 12009312.

The previous prime is 12564527. The next prime is 12564599. The reversal of 12564557 is 75546521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12564557 - 2¹⁶ = 12499021 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 (12564527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1088 + ... + 5129.

It is an arithmetic number, because the mean of its divisors is an integer number (1641552).

Almost surely, 2^12564557 is an apocalyptic number.

It is an amenable number.

12564557 is a deficient number, since it is larger than the sum of its proper divisors (567859).

12564557 is an equidigital number, since it uses as much as digits as its factorization.

12564557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6307.

The product of its digits is 42000, while the sum is 35.

The square root of 12564557 is about 3544.6518869982. The cubic root of 12564557 is about 232.4782852499.

The spelling of 12564557 in words is "twelve million, five hundred sixty-four thousand, five hundred fifty-seven".