2564551 has 4 divisors (see below), whose sum is σ = 2797704. Its totient is φ = 2331400.

The previous prime is 2564539. The next prime is 2564561. The reversal of 2564551 is 1554652.

2564551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2564551 - 2⁵ = 2564519 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 (2564521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116560 + ... + 116581.

It is an arithmetic number, because the mean of its divisors is an integer number (699426).

2^2564551 is an apocalyptic number.

2564551 is a deficient number, since it is larger than the sum of its proper divisors (233153).

2564551 is a wasteful number, since it uses less digits than its factorization.

2564551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233152.

The product of its digits is 6000, while the sum is 28.

The square root of 2564551 is about 1601.4215559933. The cubic root of 2564551 is about 136.8790912923.

The spelling of 2564551 in words is "two million, five hundred sixty-four thousand, five hundred fifty-one".