43

This number is a prime.

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The first 43 digits after the decimal point in the square root of 43 form a prime number. [Gaydos]

43 is the fourteenth prime number and its reversal is the fourteenth reversal prime. [Gaydos]

The sum of the first 43 palindromic composite numbers is divisible by 43. [Gaydos]

Concatenating a string of 43 sevens to any one or two digit number produces a composite number. 43 is the shortest string of sevens for which this is true. [Gaydos]