2564543 has 4 divisors (see below), whose sum is σ = 2570568. Its totient is φ = 2558520.

The previous prime is 2564539. The next prime is 2564561. The reversal of 2564543 is 3454652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2564543 - 2² = 2564539 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 (2564593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2321 + ... + 3242.

It is an arithmetic number, because the mean of its divisors is an integer number (642642).

2^2564543 is an apocalyptic number.

2564543 is a deficient number, since it is larger than the sum of its proper divisors (6025).

2564543 is an equidigital number, since it uses as much as digits as its factorization.

2564543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6024.

The product of its digits is 14400, while the sum is 29.

The square root of 2564543 is about 1601.4190582106. The cubic root of 2564543 is about 136.8789489627.

The spelling of 2564543 in words is "two million, five hundred sixty-four thousand, five hundred forty-three".