1637428

This number is a composite.

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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]