8053
This number is a prime.
Prime 8053 has an unusual property: every (non-null)
permutation of its digits, excepting those that produce a
leading zero, is a composite number: 8503 = 11 x 773, 5803
= 7 x 829, 5083 = 13 x 17 x 23, and all the others are
obviously divisible by either 2 or 5. Even more remarkably,
there is only one larger prime (the next one, 8059) with
this property. [Keith]
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