The apliccation LibreOffice version 5.1.x is safe for production use by most users and enterprises.
Today come with the new released version 5.1.6:
The Document Foundation (TDF) announces LibreOffice 5.1.6, the sixth minor release of the LibreOffice 5.1 family launched in January 2016, targeted at individual users and enterprise deployments. Users of previous LibreOffice releases should start planning the update to the new version.
You can read more about this here.