| ||||
|---|---|---|---|---|
| Cardinal | one hundred twenty-nine | |||
| Ordinal | 129th (one hundred twenty-ninth) | |||
| Factorization | 3 × 43 | |||
| Divisors | 1, 3, 43, 129 | |||
| Greek numeral | ΡΚΘ´ | |||
| Roman numeral | CXXIX | |||
| Binary | 100000012 | |||
| Ternary | 112103 | |||
| Senary | 3336 | |||
| Octal | 2018 | |||
| Duodecimal | A912 | |||
| Hexadecimal | 8116 | |||
129 (one hundred [and] twenty-nine) is the natural number following 128 and preceding 130.
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]
129 is a centered octahedral number. [3]
129 is also:
73 (seventy-three) is the natural number following 72 and preceding 74. In English, it is the smallest natural number with twelve letters in its spelled out name.
65 (sixty-five) is the natural number following 64 and preceding 66.
96 (ninety-six) is the natural number following 95 and preceding 97. It is a number that appears the same when turned upside down.
1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.
127 is the natural number following 126 and preceding 128. It is also a prime number.
500 is the natural number following 499 and preceding 501.
700 is the natural number following 699 and preceding 701.
600 is the natural number following 599 and preceding 601.
145 is the natural number following 144 and preceding 146.
131 is the natural number following 130 and preceding 132.
133 is the natural number following 132 and preceding 134.
136 is the natural number following 135 and preceding 137.
173 is the natural number following 172 and preceding 174.
141 is the natural number following 140 and preceding 142.
139 is the natural number following 138 and preceding 140.
154 is the natural number following 153 and preceding 155.
168 is the natural number following 167 and preceding 169.
161 is the natural number following 160 and preceding 162.
182 is the natural number following 181 and preceding 183.
40,000 is the natural number that comes after 39,999 and before 40,001. It is the square of 200.
