129 (number)

128 129 130
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Cardinal one hundred twenty-nine
Ordinal 129th
(one hundred twenty-ninth)
Factorization 3 × 43
Divisors 1, 3, 43, 129
Roman numeral CXXIX
Binary 100000012
Ternary 112103
Quaternary 20014
Quinary 10045
Senary 3336
Octal 2018
Duodecimal A912
Hexadecimal 8116
Vigesimal 6920
Base 36 3L36

129 (one hundred [and] twenty-nine) is the natural number following 128 and preceding 130.

In mathematics

129 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: , , , and .

129 is the product of only two primes, 3 and 43, making 129 a semiprime. Since 3 and 43 are both Gaussian primes, this means that 129 is a Blum integer.[1]

129 is a repdigit in base 6 (333).

129 is a happy number.[2]

In the military

In transportation

In other fields

129 is also:

See also

References

  1. "Sloane's A016105 : Blum integers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.
  2. "Sloane's A007770 : Happy numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-27.
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