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This number is a composite.
Just showing those entries submitted by 'Gaydos': (Click here to show all)
8 is the smallest cube that is the sum of two consecutive Sophie Germain primes (3 + 5). Can you find the next cube with this property? [Gaydos]
8 is the last digit to appear in both a prime number and its prime index, first appearing in 787 and 138. The other 9 digits all first appear in smaller prime-prime index pairs. [Gaydos]
(There are 3 curios for this number that have not yet been approved by an editor.)
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