2543221 has 2 divisors, whose sum is σ = 2543222. Its totient is φ = 2543220.

The previous prime is 2543201. The next prime is 2543237. The reversal of 2543221 is 1223452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2283121 + 260100 = 1511^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 2543221 - 2¹¹ = 2541173 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2543201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1271610 + 1271611.

It is an arithmetic number, because the mean of its divisors is an integer number (1271611).

2^2543221 is an apocalyptic number.

It is an amenable number.

2543221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2543221 is an equidigital number, since it uses as much as digits as its factorization.

2543221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 19.

The square root of 2543221 is about 1594.7479424661. The cubic root of 2543221 is about 136.4985486480.

Adding to 2543221 its reverse (1223452), we get a palindrome (3766673).

The spelling of 2543221 in words is "two million, five hundred forty-three thousand, two hundred twenty-one".