GCF and LCM of 9 and 19
The greatest common factor and least common multiple of 9 and 19.
GCF of 9 and 19
1
LCM of 9 and 19
171
How it works
Break each number into its prime factors:
- 9 = 3²
- 19 = 19
The GCF (1) multiplies the primes both share, at the lowest power each appears. The LCM (171) multiplies every prime that appears in either number, at the highest power — which is also 9 × 19 ÷ 1 = 171.
Try other numbers
Need a different pair? The LCM & GCF calculator computes the GCF and LCM for any two numbers.
Related pairs
Frequently asked questions
What is the GCF of 9 and 19?+
The greatest common factor (GCF) of 9 and 19 is 1 — the largest number that divides both 9 and 19 with no remainder.
What is the LCM of 9 and 19?+
The least common multiple (LCM) of 9 and 19 is 171 — the smallest number that both 9 and 19 divide into. It equals 9 × 19 ÷ GCF = 171 ÷ 1 = 171.