243288389 has 2 divisors, whose sum is σ = 243288390. Its totient is φ = 243288388.

The previous prime is 243288379. The next prime is 243288401. The reversal of 243288389 is 983882342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 233937025 + 9351364 = 15295^2 + 3058^2 .

It is a cyclic number.

It is not a de Polignac number, because 243288389 - 2⁴ = 243288373 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 (243288379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121644194 + 121644195.

It is an arithmetic number, because the mean of its divisors is an integer number (121644195).

Almost surely, 2^243288389 is an apocalyptic number.

It is an amenable number.

243288389 is a deficient number, since it is larger than the sum of its proper divisors (1).

243288389 is an equidigital number, since it uses as much as digits as its factorization.

243288389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 47.

The square root of 243288389 is about 15597.7046067683. The cubic root of 243288389 is about 624.2719107604.

The spelling of 243288389 in words is "two hundred forty-three million, two hundred eighty-eight thousand, three hundred eighty-nine".