No, 129 is not a prime number. It is a composite number: its digits add up to 12, which is divisible by 3, so 129 is divisible by 3.
129 has divisors other than 1 and itself. The smallest is 3: 129 ÷ 3 = 43.
Prime factorization: 129 = 3 × 43.
| Number | Prime? |
|---|---|
| 125 | No, 5 × 5 × 5 |
| 126 | No, 2 × 3 × 3 × 7 |
| 127 | Yes |
| 128 | No, 2 × 2 × 2 × 2 × 2 × 2 × 2 |
| 130 | No, 2 × 5 × 13 |
| 131 | Yes |
| 132 | No, 2 × 2 × 3 × 11 |
| 133 | No, 7 × 19 |
More about 129: factors of 129 · 129 squared · square root of 129 · 129 in binary · 129 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.