41

This number is a prime.

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The number of votes required to sustain a filibuster in the United States Senate. [McCranie]

President Franklin D. Roosevelt made 41 trips to Warm Springs, Georgia. [McCranie]

The only number whose square is the concatenation of two 2-digit squares: 41^2 = 1681. [Nie]

(There are 2 curios for this number that have not yet been approved by an editor.)