Thursday, November 6, 2014

1669

1669 is a prime number.

1667 and 1669 form a twin prime pair.

1669 is the smallest prime that appears in the same position as its own value when the Roman numerals (from 1 to 3999) are placed in lexicographic order. The other primes with this property are 3623 and 3631.

1669 is the smallest number whose 9th power has 29 digits.

16692 = 2785561, and 278 * (5/5) * 6 + 1 = 1669.

1669 has a representation as the sum of two squares: 1669 = 152 + 382.

1669 is the hypotenuse of a primitive Pythagorean triple: 16692 = 11402 + 12192.


Source: Prime Curios!

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