1289 (number)

Short description: Natural number

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List of numbers — Integers

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Cardinal| one thousand two hundred eighty-nine
Ordinal| 1289th
(one thousand two hundred eighty-ninth)
Factorization| prime
Prime| yes
Greek numeral| ,ΑΣΠΘ´
Roman numeral| MCCLXXXIX
Binary| 101000010012
Ternary| 12022023
Quaternary| 1100214
Quinary| 201245
Senary| 55456
Octal| 24118
Duodecimal| 8B512
Hexadecimal| 50916
Vigesimal| 34920
Base 36| ZT36

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

## Contents

* 1 In mathematics
* 2 In technology
* 3 Historical years
* 4 Notes

## 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 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 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.

## Historical years

* 1289 AD, 1289 BC.

## Notes

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "Number Gossip: 1289", March 2008, webpage: Numbergossip-1289.
2. ↑ "Apocalyptic Number -- from Wolfram MathWorld", Mathworld.Wolfram.com, August 2010, webpage: MW-Apoc.

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