245 (number)

In mathematics

• a composite number.
• palindromic in bases 34, 48, 244
• a Harshad number in bases 7, 9, 11, 15, 31, 35, 36.
• the aliquot sum of any of these numbers: 723, 1195, 2563, 3859, 9259, 10123, 12283, 14659 and 14803.
• part of the 97-aliquot tree. The aliquot sequence starting at 10222 is: 10222, 5978, 4624, 4893, 2595, 1581, 723, 245, 97, 1, 0

  In online public access (library) catalogs

In other fields

• The number of Jewish singers who returned from captivity in Babylon in c. 538 BCE following the rise of Cyrus the Great and the Persian Empire. ...besides their male and female slaves, of whom there were seven thousand three hundred thirty-seven; and they had two hundred forty-five singers, male and female. They had seven hundred thirty-six horses, two hundred forty-five mules, four hundred thirty-five camels, and six thousand seven hundred twenty donkeys..
• 245T or 2,4,5-T is a common abbreviation for the widely used herbicide 2,4,5-Trichlorophenoxyacetic acid.
• "245" is the name of a jazz instrumental by Eric Dolphy, featured on his 1960 album Outward Bound.
• 245 is the international country calling code for Guinea-Bissau.