243021089 has 2 divisors, whose sum is σ = 243021090. Its totient is φ = 243021088.

The previous prime is 243021083. The next prime is 243021091. The reversal of 243021089 is 980120342.

243021089 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., 195300625 + 47720464 = 13975^2 + 6908^2 .

It is a cyclic number.

It is not a de Polignac number, because 243021089 - 2²⁴ = 226243873 is a prime.

Together with 243021091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243021083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121510544 + 121510545.

It is an arithmetic number, because the mean of its divisors is an integer number (121510545).

Almost surely, 2^243021089 is an apocalyptic number.

It is an amenable number.

243021089 is a deficient number, since it is larger than the sum of its proper divisors (1).

243021089 is an equidigital number, since it uses as much as digits as its factorization.

243021089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 243021089 is about 15589.1336834348. The cubic root of 243021089 is about 624.0431986105.

The spelling of 243021089 in words is "two hundred forty-three million, twenty-one thousand, eighty-nine".