2165065 has 12 divisors (see below), whose sum is σ = 3022596. Its totient is φ = 1484448.

The previous prime is 2165063. The next prime is 2165077. The reversal of 2165065 is 5605612.

It can be written as a sum of positive squares in 2 ways, for example, as 1713481 + 451584 = 1309^2 + 672^2 .

It is not a de Polignac number, because 2165065 - 2¹ = 2165063 is a prime.

It is a Duffinian number.

2165065 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2165063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4174 + ... + 4663.

It is an arithmetic number, because the mean of its divisors is an integer number (251883).

2^2165065 is an apocalyptic number.

It is an amenable number.

2165065 is a deficient number, since it is larger than the sum of its proper divisors (857531).

2165065 is an equidigital number, since it uses as much as digits as its factorization.

2165065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8856 (or 8849 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2165065 is about 1471.4159846896. The cubic root of 2165065 is about 129.3670415262.

The spelling of 2165065 in words is "two million, one hundred sixty-five thousand, sixty-five".