2181131 has 2 divisors, whose sum is σ = 2181132. Its totient is φ = 2181130.

The previous prime is 2181097. The next prime is 2181139. The reversal of 2181131 is 1311812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2181131 - 2¹⁰ = 2180107 is a prime.

It is a super-2 number, since 2×2181131² = 9514664878322, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2181139) 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 as a sum of consecutive naturals, namely, 1090565 + 1090566.

It is an arithmetic number, because the mean of its divisors is an integer number (1090566).

2^2181131 is an apocalyptic number.

2181131 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181131 is an equidigital number, since it uses as much as digits as its factorization.

2181131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 17.

The square root of 2181131 is about 1476.8652612882. The cubic root of 2181131 is about 129.6862453355.

Adding to 2181131 its reverse (1311812), we get a palindrome (3492943).

The spelling of 2181131 in words is "two million, one hundred eighty-one thousand, one hundred thirty-one".