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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ "FORMULA 409" claims that it "cleans and degreases virtually any hard, nonporous surface; no rinsing required."

+ A high-powered Chevrolet engine introduced in 1961 measured 409 cubic inches, which was large for its time. It was immortalized by the Beach Boys in the song "409" which starts out, "She's real fine, my 409." [Litman]

+ The concatenation of the first 409 odd numbers in reverse order is prime. [Gupta]

+ The smallest prime which along with both its neighbors uses non-prime digits (401, 409, 419). [Murthy]

+ The product of the positive even digits plus the sum of the odd digits. [Silva]

+ The number of primes below ten thousand that form members of twin prime pairs. [Beedassy]

+ Largest prime number that is smaller than the square of its smallest primitive root. [Dunkelblau]

+ Smallest prime whose smallest positive primitive root is odd and composite. [Vantieghem]

+ The smallest holey Cyclops prime. [Gupta]

+ The smallest Cyclops prime that does not become a smaller prime when its zero is removed. [Gaydos]

+ The highest point in Washington DC is 409 feet above sea level. [Gaydos]

(There are 4 curios for this number that have not yet been approved by an editor.)

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