129 (number)

From Freepedia

129 is the natural number following 128 and preceding 130.

<< 120 121 122 123 124 125 126 127 128 129 >> List of numbers -- Integers << 100 110 120 130 140 150 160 170 180 190 >>
Cardinal	One hundred [and] twenty-nine
Ordinal	129th
Factorization	<math>3\cdot43</math>
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: <math>11^2+2^2+2^2</math> and <math>10^2+5^2+2^2</math> and <math>8^2+8^2+1^2</math> and <math>8^2+7^2+4^2</math>.

One hundred [and] 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.