361,000 people watched all nine episodes of "Stranger Things 2" the first day it became available on Netflix, according to Nielsen.

An average of 4 million viewers watched each episode of "Stranger Things 2."

"Stranger Things 2" is a certified hit — at least according to Nielsen.

The show became available for streaming less than a week ago, but it's already pulling in remarkable numbers, according to Nielsen data released Thursday.

A whopping 361,000 US viewers binge-watched all nine episodes of "Stranger Things 2" on Netflix within the first day that the new season was made available.

But perhaps more impressively, 15.8 million US viewers watched the first episode of "Stranger Things 2" within the first three days. That puts it in the ballpark of cable TV's biggest smash hits. And, all episodes of "Stranger Things 2" averaged around 4 million US viewers, according to the data.

Nielsen employed its new SVOD solution — created to measure subscription-based streaming content — to calculate the number of US viewers who watched "Stranger Things 2" this past weekend. That measurement has been controversial, as Netflix and others have disputed its accuracy.