243022189 has 2 divisors, whose sum is σ = 243022190. Its totient is φ = 243022188.

The previous prime is 243022187. The next prime is 243022193. The reversal of 243022189 is 981220342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235376964 + 7645225 = 15342^2 + 2765^2 .

It is a cyclic number.

It is not a de Polignac number, because 243022189 - 2¹ = 243022187 is a prime.

Together with 243022187, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 243022189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243022181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121511094 + 121511095.

It is an arithmetic number, because the mean of its divisors is an integer number (121511095).

Almost surely, 2^243022189 is an apocalyptic number.

It is an amenable number.

243022189 is a deficient number, since it is larger than the sum of its proper divisors (1).

243022189 is an equidigital number, since it uses as much as digits as its factorization.

243022189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 243022189 is about 15589.1689643804. The cubic root of 243022189 is about 624.0441401564.

The spelling of 243022189 in words is "two hundred forty-three million, twenty-two thousand, one hundred eighty-nine".