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What is the Least Common Multiple of 1581 and 1586?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least common multiple (LCM) of 1581 and 1586 is 2507466.

LCM(1581,1586) = 2507466

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Least Common Multiple of 1581 and 1586 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1581 and 1586, than apply into the LCM equation.

GCF(1581,1586) = 1
LCM(1581,1586) = ( 1581 × 1586) / 1
LCM(1581,1586) = 2507466 / 1
LCM(1581,1586) = 2507466

Least Common Multiple (LCM) of 1581 and 1586 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1581 and 1586. First we will calculate the prime factors of 1581 and 1586.

Prime Factorization of 1581

Prime factors of 1581 are 3, 17, 31. Prime factorization of 1581 in exponential form is:

1581 = 31 × 171 × 311

Prime Factorization of 1586

Prime factors of 1586 are 2, 13, 61. Prime factorization of 1586 in exponential form is:

1586 = 21 × 131 × 611

Now multiplying the highest exponent prime factors to calculate the LCM of 1581 and 1586.

LCM(1581,1586) = 31 × 171 × 311 × 21 × 131 × 611
LCM(1581,1586) = 2507466