What does the number in NieR Replicant ver.1.22474487139 mean?

Read the suffix as mathematics. 1.22474487139 is the square root of 1.5, carried to eleven decimal places. When Square Enix and developer Toylogic rebuilt NieR Replicant for its April 2021 release, they refused the usual labels. The team described the project as a version upgrade, not a remake and not a remaster, and the number is that position statement in numerical form: the original game, raised by half a step. Version 1.5, expressed as a root because the game itself sits between categories.

The upgrade was real work, not a port. Toylogic rebuilt the game for modern hardware, and the production went back to the cutting room floor: restored material that the 2010 release had dropped was completed and woven in, and the game gained a new Ending E beyond the original four, continuing a story the first version left closed. For players outside Japan it carried a second significance: this was the first worldwide release of the brother version, the Replicant cut that had stayed in Japan for eleven years.

The reported reading of the number, that it encodes the game's in-between status, matches how the developers themselves talk about the project, and it has never been contradicted by them. Treat it the way this page treats all good box copy: the mathematics is exact, the meaning is the makers' own framing, and the eleven decimal places are the joke told straight faced.