245

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).

Source: What's Special About This Number?