2181164 has 6 divisors (see below), whose sum is σ = 3817044. Its totient is φ = 1090580.

The previous prime is 2181161. The next prime is 2181169. The reversal of 2181164 is 4611812.

It is not an unprimeable number, because it can be changed into a prime (2181161) 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, 272642 + ... + 272649.

It is an arithmetic number, because the mean of its divisors is an integer number (636174).

2^2181164 is an apocalyptic number.

It is an amenable number.

2181164 is a deficient number, since it is larger than the sum of its proper divisors (1635880).

2181164 is a wasteful number, since it uses less digits than its factorization.

2181164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545295 (or 545293 counting only the distinct ones).

The product of its digits is 384, while the sum is 23.

The square root of 2181164 is about 1476.8764335583. The cubic root of 2181164 is about 129.6868993730.

Adding to 2181164 its reverse (4611812), we get a palindrome (6792976).

The spelling of 2181164 in words is "two million, one hundred eighty-one thousand, one hundred sixty-four".