307

This number is a prime.

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Smallest nonpalindromic prime with a palindromic square. The next one is 30001253. [Gaydos]

307 permutations of the digits of 2^20 (1048576) are prime numbers. [Gaydos]

307 and its prime index (63) are both reverse triangular numbers. Are there any more examples of this property? [Gaydos]

If the letters in abc * de = fgh * ij each represents a different digit, then 307 is the only 3-digit prime appearing in 307 * 58 = 614 * 29. [Gaydos]