2181146 has 12 divisors (see below), whose sum is σ = 3596586. Its totient is φ = 991320.

The previous prime is 2181139. The next prime is 2181149. The reversal of 2181146 is 6411812.

It can be written as a sum of positive squares in only one way, i.e., 1890625 + 290521 = 1375^2 + 539^2 .

It is not an unprimeable number, because it can be changed into a prime (2181149) 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 in 5 ways as a sum of consecutive naturals, for example, 4265 + ... + 4748.

2^2181146 is an apocalyptic number.

2181146 is a deficient number, since it is larger than the sum of its proper divisors (1415440).

2181146 is a wasteful number, since it uses less digits than its factorization.

2181146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9037 (or 9026 counting only the distinct ones).

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

The square root of 2181146 is about 1476.8703396033. The cubic root of 2181146 is about 129.6865426261.

Adding to 2181146 its reverse (6411812), we get a palindrome (8592958).

The spelling of 2181146 in words is "two million, one hundred eighty-one thousand, one hundred forty-six".