# 7331

This number is a prime.

The smallest prime whose conversion from seconds into hours, minutes, and seconds, gives a prime number of hours, minutes, and seconds (7331*s* = 2*h* 2*m* 11*s*). [Thoms]

The larger of only two right-truncatable primes formed by concatenating two double-digit right-truncatable emirps. The other is 3137. [Loungrides]

The largest of only three right-truncatable primes, each formed by concatenating two double-digit emirps. The other two are 3137 and 3797. Note that 7331 is the only right-truncatable prime concatenated in descending order from two double-digit emirps. [Loungrides]

The only prime concatenated from two double-digit primes p, g whose first prime is the 73. [Loungrides]

7331, 73331, 733331 and 7333331 are all prime numbers. [Anitha]