Number Gossip
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Unique Properties of 997
- 997 is the largest three-digit prime
- 997 is the smallest prime of form 10p - p, where p is prime
- 997 is the smallest prime p such that the sum of the digits of p is not prime, but the sum of the squares of the digits of p is prime
- 997 is the smallest prime p such that the sum of the digits of p is not prime, but the sum of the cubes of the digits of p is prime
- 997 is the smallest prime with digit sum 25
- 997 is the smallest prime p such that the digit sum of p is an odd composite number