2565205 has 4 divisors (see below), whose sum is σ = 3078252. Its totient is φ = 2052160.

The previous prime is 2565203. The next prime is 2565221. The reversal of 2565205 is 5025652.

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 677329 + 1887876 = 823^2 + 1374^2 .

It is not a de Polignac number, because 2565205 - 2¹ = 2565203 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 2565205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565203) 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, 256516 + ... + 256525.

It is an arithmetic number, because the mean of its divisors is an integer number (769563).

2^2565205 is an apocalyptic number.

It is an amenable number.

2565205 is a deficient number, since it is larger than the sum of its proper divisors (513047).

2565205 is an equidigital number, since it uses as much as digits as its factorization.

2565205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513046.

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

The square root of 2565205 is about 1601.6257365565. The cubic root of 2565205 is about 136.8907257288.

It can be divided in two parts, 2565 and 205, that multiplied together give a triangular number (525825 = T₁₀₂₅).

The spelling of 2565205 in words is "two million, five hundred sixty-five thousand, two hundred five".