2161365 has 16 divisors (see below), whose sum is σ = 3499200. Its totient is φ = 1139072.

The previous prime is 2161349. The next prime is 2161373. The reversal of 2161365 is 5631612.

It is a cyclic number.

It is not a de Polignac number, because 2161365 - 2⁴ = 2161349 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526 + ... + 2144.

It is an arithmetic number, because the mean of its divisors is an integer number (218700).

2^2161365 is an apocalyptic number.

It is an amenable number.

2161365 is a deficient number, since it is larger than the sum of its proper divisors (1337835).

2161365 is a wasteful number, since it uses less digits than its factorization.

2161365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716.

The product of its digits is 1080, while the sum is 24.

The square root of 2161365 is about 1470.1581547575. The cubic root of 2161365 is about 129.2933053287.

Adding to 2161365 its reverse (5631612), we get a palindrome (7792977).

The spelling of 2161365 in words is "two million, one hundred sixty-one thousand, three hundred sixty-five".