1289 (number)

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

← 1288 1289 1290 →
List of numbers Integers ← 0 1k 2k 3k 4k 5k 6k 7k 8k 9k →
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, mcclxxxix
Binary	101000010012
Ternary	12022023
Senary	55456
Octal	24118
Duodecimal	8B512
Hexadecimal	50916

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.