Getters and Setters in Kotlin

guys. I'm new in Kotlin and I'm trying to figure out how to use getters and setters in Kotlin. In java I need to write getters on my own(generate by ide) or use Annotations like @Getter in lombok, which was pretty simple. Kotlin however has getters and setters by default. https://kotlinlang.org/docs/reference/properties.html But I can't understand how to use it.

I want to make it, lets say - similar to java:

private val isEmpty: String
        get() = this.toString() //making this thing public rises an error: Getter visibility must be the same as property visibility.

So how getters work?