2172165 has 16 divisors (see below), whose sum is σ = 3499200. Its totient is φ = 1150592.

The previous prime is 2172161. The next prime is 2172173. The reversal of 2172165 is 5612712.

It is a cyclic number.

It is not a de Polignac number, because 2172165 - 2² = 2172161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172161) 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 15 ways as a sum of consecutive naturals, for example, 2281 + ... + 3089.

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

2^2172165 is an apocalyptic number.

It is an amenable number.

2172165 is a deficient number, since it is larger than the sum of its proper divisors (1327035).

2172165 is a wasteful number, since it uses less digits than its factorization.

2172165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996.

The product of its digits is 840, while the sum is 24.

The square root of 2172165 is about 1473.8266519506. The cubic root of 2172165 is about 129.5083003778.

Adding to 2172165 its reverse (5612712), we get a palindrome (7784877).

The spelling of 2172165 in words is "two million, one hundred seventy-two thousand, one hundred sixty-five".