551
Chapter 14 contains the prophecy about the First Beit ha-Mikdash, which was erected by King Shlomo and destroyed during the Babylonian invasion. Chapter 53, in its turn, refers to the Second Beit ha-Mikdash, destroyed by the Romans. The word “naval” (« fool » or « wicked man ») is a hint to Titus.
See more: Tehillim with Rashi’s commentary, Metzudat David and Metzudat Tzion.