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6 (six) is the natural number following 5 and preceding 7. It is a composite number and the smallest perfect number.
6 is the smallest positive integer which is neither a square number nor a prime number. Six is the second smallest composite number; its proper divisors are 1, 2 and 3.
Since six equals the sum of its proper divisors, six is the smallest perfect number, Granville number, and {\displaystyle {\mathcal {S}}}{\mathcal {S}}-perfect number.
As a perfect number:
6 is related to the Mersenne prime 3, since 21(22 – 1) = 6. (The next perfect number is 28.)
6 is the only even perfect number that is not the sum of successive odd cubes.
6 is the root of the 6-aliquot tree, and is itself the aliquot sum of only one number; the square number, 25.
Six is the only number that is both the sum and the product if three consecutive positive numbers.
Unrelated to 6's being a perfect number, a Golomb ruler of length 6 is a "perfect ruler". Six is a congruent number.
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