Following iOS 6.1’s release to the general public on Monday, Apple said that iOS 6 is now shipping on more than 300 million devices worldwide. That includes iPhones, iPod touches and iPads. Apple’s has shipped 500 million iOS devices in total, which would indicate that more than half of all iOS devices – about 60 percent – are running iOS 6.

A recent report in the Economist penned by Glenn Fleishman says that according to Google’s own data, the same percentage of the 600 million Android devices ever made – about 360 million units – run operating system releases prior to version 4.0. Fleishman says it’s a security risk, because Google is unable to serve those older devices with patches and system updates, often by design from their manufacturers or the system carriers they’re operating through.

During Apple’s previous quarterly call in October, Cook told analysts that iOS 6 had been downloaded to more than 200 million devices, and called it “the fastest software upgrade rate in history, that we’re aware of.” In a statement, Apple senior vice president of Worldwide Marketing Phil Schiller echoed Cook’s comments, saying that iOS 6 “may be the most popular new version of an OS in history.”