Based on common file-naming conventions found on sharing sites, the string can be interpreted as: L33t speak for "Il Primo Re." 2019: The year of the film's release.
The string you provided appears to be a file name for the 2019 Italian epic film (The First King), directed by Matteo Rovere . Movie Details Title: Il Primo Re (The First King). Release Year: 2019. Director: Matteo Rovere. 11_pr1m0_R3_2019_Altadefinizione01_1080p_HD_Blu...
A reference to the Italian streaming or hosting site "Altadefinizione." Based on common file-naming conventions found on sharing