2161165 has 16 divisors (see below), whose sum is σ = 2727936. Its totient is φ = 1641600.

The previous prime is 2161163. The next prime is 2161177. The reversal of 2161165 is 5611612.

2161165 is nontrivially palindromic in base 9.

It is not a de Polignac number, because 2161165 - 2¹ = 2161163 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11220 + ... + 11410.

It is an arithmetic number, because the mean of its divisors is an integer number (170496).

2^2161165 is an apocalyptic number.

It is an amenable number.

2161165 is a deficient number, since it is larger than the sum of its proper divisors (566771).

2161165 is a wasteful number, since it uses less digits than its factorization.

2161165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300.

The product of its digits is 360, while the sum is 22.

The square root of 2161165 is about 1470.0901332912. The cubic root of 2161165 is about 129.2893171918.

Adding to 2161165 its reverse (5611612), we get a palindrome (7772777).

The spelling of 2161165 in words is "two million, one hundred sixty-one thousand, one hundred sixty-five".