# 1289 (number)

 ← 1288 1289 1290 →
Cardinalone thousand two hundred eighty-nine
Ordinal1289th
(one thousand two hundred eighty-ninth)
Factorizationprime
Primeyes
Greek numeral,ΑΣΠΘ´
Roman numeralMCCLXXXIX
Binary101000010012
Ternary12022023
Quaternary1100214
Quinary201245
Senary55456
Octal24118
Duodecimal8B512
Vigesimal34920
Base 36ZT36

The number 1289 (twelve hundred eighty-nine) is the natural number following 1288 and preceding 1290.[1]

## In mathematics

The number 1289 is an odd prime number, following 1283 and preceding 1291.[1] It is classified as an apocalyptic power, a deficient number, and an evil number:[1]

• 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.[1][2]
• The number 1289 is classed as a deficient number because the sum of all its positive divisors (except itself) totals less than 1289.[1] 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.[1]

## 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.

## Notes

1. "Number Gossip: 1289", March 2008, webpage: Numbergossip-1289.
2. ^ "Apocalyptic Number -- from Wolfram MathWorld", Mathworld.Wolfram.com, August 2010, webpage: MW-Apoc.