2005565 has 4 divisors (see below), whose sum is σ = 2406684. Its totient is φ = 1604448.

The previous prime is 2005559. The next prime is 2005567. The reversal of 2005565 is 5655002.

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 1125721 + 879844 = 1061^2 + 938^2 .

It is a cyclic number.

It is not a de Polignac number, because 2005565 - 2¹² = 2001469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2005565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005567) by changing a digit.

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, 200552 + ... + 200561.

It is an arithmetic number, because the mean of its divisors is an integer number (601671).

2^2005565 is an apocalyptic number.

It is an amenable number.

2005565 is a deficient number, since it is larger than the sum of its proper divisors (401119).

2005565 is an equidigital number, since it uses as much as digits as its factorization.

2005565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401118.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 2005565 is about 1416.1797202333. The cubic root of 2005565 is about 126.1088544486.

The spelling of 2005565 in words is "two million, five thousand, five hundred sixty-five".