2163181 has 2 divisors, whose sum is σ = 2163182. Its totient is φ = 2163180.

The previous prime is 2163167. The next prime is 2163193. The reversal of 2163181 is 1813612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1946025 + 217156 = 1395^2 + 466^2 .

It is a cyclic number.

It is not a de Polignac number, because 2163181 - 2¹⁷ = 2032109 is a prime.

It is a super-2 number, since 2×2163181² = 9358704077522, which contains 22 as substring.

It is equal to p₁₆₀₁₇₇ and since 2163181 and 160177 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2163101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1081590 + 1081591.

It is an arithmetic number, because the mean of its divisors is an integer number (1081591).

2^2163181 is an apocalyptic number.

It is an amenable number.

2163181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2163181 is an equidigital number, since it uses as much as digits as its factorization.

2163181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 2163181 is about 1470.7756457054. The cubic root of 2163181 is about 129.3295063581.

Adding to 2163181 its reverse (1813612), we get a palindrome (3976793).

It can be divided in two parts, 21631 and 81, that added together give a palindrome (21712).

The spelling of 2163181 in words is "two million, one hundred sixty-three thousand, one hundred eighty-one".