+ The nearest whole number of meters in a mile is prime. [Wu]

+ The house at 1609 16th St. NW in Washington, D.C. (H. Cornell Wilson House) was the home/office of the Einstein-like scientist Dr. Barnhardt in the classic movie The Day the Earth Stood Still. [McCranie]

+ The year Galileo turned a telescope to the sky, and turned man's view of the world upside down. Note that 1609 turned upside down gives another prime, making 1609 an invertible prime. [Teague]

+ The smallest prime number formed from the leading digits of the natural logarithm of the first composite number. [Gudipati]

+ Danish astronomer Tycho Brahe announced his first two laws in the year 1609. [Upadhyay]

(There are 3 curios for this number that have not yet been approved by an editor.)

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