2181373 has 2 divisors, whose sum is σ = 2181374. Its totient is φ = 2181372.

The previous prime is 2181359. The next prime is 2181379. The reversal of 2181373 is 3731812.

2181373 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1338649 + 842724 = 1157^2 + 918^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181373 - 2⁵ = 2181341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090686 + 1090687.

It is an arithmetic number, because the mean of its divisors is an integer number (1090687).

2^2181373 is an apocalyptic number.

It is an amenable number.

2181373 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181373 is an equidigital number, since it uses as much as digits as its factorization.

2181373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 2181373 is about 1476.9471893064. The cubic root of 2181373 is about 129.6910414575.

The spelling of 2181373 in words is "two million, one hundred eighty-one thousand, three hundred seventy-three".