The Ultimate 129 (number) - American History Information Guide and Reference

129 is the natural number following 128 and preceding 130.


Cardinal	One hundred [and] twenty-nine
Ordinal	129th
Factorization	$3\cdot43$
Roman numeral	CXXIX
Binary	10000001
Hexadecimal	81

This number is the sum of the first ten prime numbers. It is the smallest number that can be expressed as a sum of three squares in four different ways: $112 + 2 2 + 2 2$ and $102 + 5 2 + 2 2$ and $82 + 8 2 + 1 2$ and $82 + 7 2 + 4 2$ .

One hundred twenty-nine is also:

The designation of a spur route of Interstate 29 in Sioux City, Iowa.
The year AD 129 or 129 BC.

This page discusses the number 129. For the year, see 129.

Categories: Integers

Your American History Reference Guide! - 129 (number)

129 (number)

Your American History Reference Guide!
- 129 (number)