1289 (number)

In mathematics

• The number 1289 is called an apocalyptic power because 2¹²⁸⁹ contains the consecutive digits 666, as the Number of the Beast: in the sequence..., 1281, 1285, 1286, 1289, 1290, 1298, 1301, etc.
• The number 1289 is classed as a deficient number because the sum of all its positive divisors totals less than 1289. Compare with perfect and abundant numbers.
• The number 1289 is classed as an evil number because it has an even number of 1's contained in its binary expansion.

  In technology

• 1289 is a 4.5 volt battery with 3 "B Size" cells in flat side-by-side format with brass-strip connections, also known as MN1203, 3LR12 and many other IEC "R12" variations. Used in Rear cycle lamps, hand torches and in pairs in many Continental European Radio models.

  Historical years

• 1289 AD, 1289 BC.