9721
This number is a prime.
The largest prime (emirp) whose rearrangement of digits
gives the famous Hardy-Ramanujan number (1729). [Loungrides]
The largest prime (emirp) factor of 1234567. [Loungrides]
The largest prime number that is smaller than the reverse
of its prime index (9911). [Gaydos]
(There is one curio for this number that has not yet been approved by an editor.)
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