1289 (number)

The number 1289 (twelve hundred eighty-nine) is the natural number following 1288 and preceding 1290.

In mathematics

The number 1289 is an odd prime number, following 1283 and preceding 1291. It is classified as an apocalyptic power, a deficient number, and an evil number:

• The number 1289 is called an apocalyptic power because 2¹²⁸⁹ contains the consecutive digits 666 (in decimal), 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 (except itself) 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 cells in flat side-by-side format with brass-strip connections, also known as MN1203, 3LR12 and many other "R12" variations.

Historical years

• 1289 AD, 1289 BC.