2160181 has 4 divisors (see below), whose sum is σ = 2234700. Its totient is φ = 2085664.

The previous prime is 2160161. The next prime is 2160203. The reversal of 2160181 is 1810612.

2160181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1285956 + 874225 = 1134^2 + 935^2 .

It is a cyclic number.

It is not a de Polignac number, because 2160181 - 2⁵ = 2160149 is a prime.

It is a super-2 number, since 2×2160181² = 9332763905522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2160101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37216 + ... + 37273.

It is an arithmetic number, because the mean of its divisors is an integer number (558675).

2^2160181 is an apocalyptic number.

It is an amenable number.

2160181 is a deficient number, since it is larger than the sum of its proper divisors (74519).

2160181 is an equidigital number, since it uses as much as digits as its factorization.

2160181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74518.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 2160181 is about 1469.7554218304. The cubic root of 2160181 is about 129.2696919740.

Adding to 2160181 its reverse (1810612), we get a palindrome (3970793).

The spelling of 2160181 in words is "two million, one hundred sixty thousand, one hundred eighty-one".