Factors of 143

How to find the factors of 143

Test every whole number from 1 up to the square root of 143 (√143 ≈ 11.958). Each number that divides evenly gives you two factors at once: the divisor and the quotient.

• 143 ÷ 1 = 143 — so 1 and 143 are factors
• 143 ÷ 2 = 71.5 — not a whole number
• 143 ÷ 3 = 47.667 — not a whole number
• 143 ÷ 4 = 35.75 — not a whole number
• 143 ÷ 5 = 28.6 — not a whole number
• 143 ÷ 6 = 23.833 — not a whole number
• 143 ÷ 7 = 20.429 — not a whole number
• 143 ÷ 8 = 17.875 — not a whole number
• 143 ÷ 9 = 15.889 — not a whole number
• 143 ÷ 10 = 14.3 — not a whole number
• 143 ÷ 11 = 13 — so 11 and 13 are factors

Collecting both numbers from every successful division gives the complete list: 1, 11, 13 and 143.

Prime factorization of 143

Divide by the smallest prime that fits, and keep going until the quotient is 1:

The primes you divided by give 143 = 11 × 13. From the exponents you can also count the factors without listing them: (1 + 1) × (1 + 1) = 4.

Properties of 143

• 143 is a composite number.
• The sum of all its factors is 168; the sum of its proper factors (excluding 143) is 25, which makes it a deficient number (its proper factors add up to less than itself).
• 143 is not a perfect square, so its factors pair up evenly.
• Multiples of 143 include 286, 429, 572, 715 and so on.

Factors vs. multiples

Factors of 143 are the numbers that divide into it; multiples of 143 are the numbers it divides into. Every number has a limited set of factors but infinitely many multiples. To work with any other number, use the factors calculator, or find shared factors with the GCF calculator.