2205565 has 4 divisors (see below), whose sum is σ = 2646684. Its totient is φ = 1764448.

The previous prime is 2205551. The next prime is 2205587. The reversal of 2205565 is 5655022.

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 1179396 + 1026169 = 1086^2 + 1013^2 .

It is a cyclic number.

It is not a de Polignac number, because 2205565 - 2²¹ = 108413 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 220552 + ... + 220561.

It is an arithmetic number, because the mean of its divisors is an integer number (661671).

2^2205565 is an apocalyptic number.

It is an amenable number.

2205565 is a deficient number, since it is larger than the sum of its proper divisors (441119).

2205565 is an equidigital number, since it uses as much as digits as its factorization.

2205565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441118.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 2205565 is about 1485.1144737023. The cubic root of 2205565 is about 130.1687158547.

The spelling of 2205565 in words is "two million, two hundred five thousand, five hundred sixty-five".