This number is a prime.

+ 4909 is a pernicious prime because it contains a prime number of ones in its binary representation.

+ The Gregorian calendar is just a tad out of sync with Earth’s trip ’round the sun. The difference isn’t huge — we’ll have an extra day to deal with by 4909 CE. [Plumer]

(There is one curio for this number that has not yet been approved by an editor.)

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