Prime Factorization of 123

Find the prime factorization of 123. Express 123 as a product of prime numbers.

Prime factorization of
Answer: 123 = 3 × 41
Step-by-Step Solution
Step 1 Understand Prime Factorization

To find the prime factorization of 123, we need to express it as a product of prime numbers.


We do this by repeatedly dividing by the smallest prime that divides evenly, starting with 2.

A prime number is only divisible by 1 and itself (2, 3, 5, 7, 11, 13, ...).

Step 2 Check Divisibility by 2

123 is an odd number, so it is not divisible by 2.

We move on to check the next prime number: 3.

Step 3 Divide by 3

3 is a prime number that divides our current value. We can divide by 3 once:


123 ÷ 3 = 41

After dividing by 3, we have 41 remaining.

Step 4 Final Prime Factor

We are left with 41, which is greater than 1.

41 cannot be divided by any prime smaller than its square root.

Therefore, 41 is itself a prime number and is our final factor.

Step 5 Write the Prime Factorization

Now we combine all the prime factors we found:


Expanded form: 123 = 3 × 41


Exponential form: 123 = 3 × 41


We can verify: 3 × 41 = 123 ✓