1637428
This number is a composite.
1637428, 1637429, 1637450, 1637452, 1637458, 1637459, and
1637480 are the smallest case of seven consecutive distinct
digit numbers that are all reverse primes. The two other
such cases are 17064298 to 17064359 and 968320541 to
968320741. There are none longer than seven. [Gaydos]
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