129 (number)

129 is the natural number following 128 and preceding 130.

colspan=2\|
a href="/encyclopedia/Cardinal-number" title="Cardinal number">Cardinal	One hundred and twenty-nine
a href="/encyclopedia/Ordinal-number" title="Ordinal number">Ordinal	129th
a href="/encyclopedia/Factorization" title="Factorization">Factorization	$3\cdot43$
a href="/encyclopedia/Roman-numeral" title="Roman numeral">Roman numeral	CXXIX
a href="/encyclopedia/Binary-numeral-system" title="Binary numeral system">Binary	10000001
a href="/encyclopedia/Hexadecimal" title="Hexadecimal">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:

11^2+2^2+2^2

and

10^2+5^2+2^2

and

8^2+8^2+1^2

and

8^2+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.

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