2569561 has 4 divisors (see below), whose sum is σ = 2605824. Its totient is φ = 2533300.

The previous prime is 2569549. The next prime is 2569571. The reversal of 2569561 is 1659652.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2569561 - 2⁵ = 2569529 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 (2569571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18025 + ... + 18166.

It is an arithmetic number, because the mean of its divisors is an integer number (651456).

2^2569561 is an apocalyptic number.

It is an amenable number.

2569561 is a deficient number, since it is larger than the sum of its proper divisors (36263).

2569561 is an equidigital number, since it uses as much as digits as its factorization.

2569561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36262.

The product of its digits is 16200, while the sum is 34.

The square root of 2569561 is about 1602.9850280024. The cubic root of 2569561 is about 136.9681670761.

Subtracting from 2569561 its reverse (1659652), we obtain a palindrome (909909).

The spelling of 2569561 in words is "two million, five hundred sixty-nine thousand, five hundred sixty-one".