2209565 has 4 divisors (see below), whose sum is σ = 2651484. Its totient is φ = 1767648.

The previous prime is 2209549. The next prime is 2209579. The reversal of 2209565 is 5659022.

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 743044 + 1466521 = 862^2 + 1211^2 .

It is a cyclic number.

It is not a de Polignac number, because 2209565 - 2⁴ = 2209549 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon 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, 220952 + ... + 220961.

It is an arithmetic number, because the mean of its divisors is an integer number (662871).

2^2209565 is an apocalyptic number.

It is an amenable number.

2209565 is a deficient number, since it is larger than the sum of its proper divisors (441919).

2209565 is an equidigital number, since it uses as much as digits as its factorization.

2209565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441918.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 2209565 is about 1486.4605611990. The cubic root of 2209565 is about 130.2473594095.

The spelling of 2209565 in words is "two million, two hundred nine thousand, five hundred sixty-five".