2143165 has 4 divisors (see below), whose sum is σ = 2571804. Its totient is φ = 1714528.

The previous prime is 2143157. The next prime is 2143177. The reversal of 2143165 is 5613412.

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 363609 + 1779556 = 603^2 + 1334^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143165 - 2³ = 2143157 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214312 + ... + 214321.

It is an arithmetic number, because the mean of its divisors is an integer number (642951).

2^2143165 is an apocalyptic number.

It is an amenable number.

2143165 is a deficient number, since it is larger than the sum of its proper divisors (428639).

2143165 is an equidigital number, since it uses as much as digits as its factorization.

2143165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428638.

The product of its digits is 720, while the sum is 22.

The square root of 2143165 is about 1463.9552588792. The cubic root of 2143165 is about 128.9293726320.

Adding to 2143165 its reverse (5613412), we get a palindrome (7756577).

The spelling of 2143165 in words is "two million, one hundred forty-three thousand, one hundred sixty-five".