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Numbers / 129

The Number 129

129 is composite: factorization 3 × 43. That gives 129 exactly 4 divisors: 1, 3, 43, 129. 129's proper divisors total just 47, 82 short of 129, the deficient case most of 129's neighbors share too. 129 has a digit sum of 12; for 129, the digital root works out to 3. 129: 3 all divide 129 evenly, out of 2-12. 129 is 10000001 in binary and 81 in hex; as a Roman numeral it's CXXIX.

Factors
1, 3, 43, 129
Number of factors
4
Prime?
No
Prime factorization
3 x 43
Even or odd
Odd
Square
16641
Cube
2146689
Binary
10000001
Hexadecimal
81
Roman numeral
CXXIX
Perfect square?
No
Perfect cube?
No
Perfect number?
No
Triangular number?
No
Fibonacci number?
No
Factors of 129 in detail →Is 129 prime? →