2181139 has 2 divisors, whose sum is σ = 2181140. Its totient is φ = 2181138.

The previous prime is 2181131. The next prime is 2181149. The reversal of 2181139 is 9311812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2181139 - 2³ = 2181131 is a prime.

It is not a weakly prime, because it can be changed into another prime (2181131) 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, 1090569 + 1090570.

It is an arithmetic number, because the mean of its divisors is an integer number (1090570).

2^2181139 is an apocalyptic number.

2181139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181139 is an equidigital number, since it uses as much as digits as its factorization.

2181139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 25.

The square root of 2181139 is about 1476.8679697251. The cubic root of 2181139 is about 129.6864038907.

The spelling of 2181139 in words is "two million, one hundred eighty-one thousand, one hundred thirty-nine".