2161171 has 4 divisors (see below), whose sum is σ = 2169144. Its totient is φ = 2153200.

The previous prime is 2161163. The next prime is 2161177. The reversal of 2161171 is 1711612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2161171 - 2³ = 2161163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3565 + ... + 4126.

It is an arithmetic number, because the mean of its divisors is an integer number (542286).

2^2161171 is an apocalyptic number.

2161171 is a deficient number, since it is larger than the sum of its proper divisors (7973).

2161171 is an equidigital number, since it uses as much as digits as its factorization.

2161171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7972.

The product of its digits is 84, while the sum is 19.

The square root of 2161171 is about 1470.0921739809. The cubic root of 2161171 is about 129.2894368395.

Adding to 2161171 its reverse (1711612), we get a palindrome (3872783).

It can be divided in two parts, 2161 and 171, that added together give a palindrome (2332).

The spelling of 2161171 in words is "two million, one hundred sixty-one thousand, one hundred seventy-one".