245 = 5 x 72.
245 has a representation as a sum of two squares: 245 = 72 + 142.
245 is a stella octangula number.
2452 is one of three square numbers using the same digits: 2452 = 60025, 1602 = 25600, and 2502 = 62500.
245 is the number of Jewish singers who returned from captivity in Babylon following the rise of Cyrus the Great and the Persian Empire (Nehemiah, chapter 7, verse 67).