2563565 has 4 divisors (see below), whose sum is σ = 3076284. Its totient is φ = 2050848.

The previous prime is 2563553. The next prime is 2563601. The reversal of 2563565 is 5653652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1713481 + 850084 = 1309^2 + 922^2 .

It is a cyclic number.

It is not a de Polignac number, because 2563565 - 2¹⁸ = 2301421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256352 + ... + 256361.

It is an arithmetic number, because the mean of its divisors is an integer number (769071).

2^2563565 is an apocalyptic number.

It is an amenable number.

2563565 is a deficient number, since it is larger than the sum of its proper divisors (512719).

2563565 is an equidigital number, since it uses as much as digits as its factorization.

2563565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512718.

The product of its digits is 27000, while the sum is 32.

The square root of 2563565 is about 1601.1136749151. The cubic root of 2563565 is about 136.8615469496.

The spelling of 2563565 in words is "two million, five hundred sixty-three thousand, five hundred sixty-five".