# 4649

This number is a prime.

The smallest composite-digit prime whose prime factors of its digits form another prime when they are concatenated left-to-right. [Honaker]

The greatest prime factor of any seven-digit repdigit. [La Haye]

4649 is formed from two consecutive semiprimes (46 and 49); each of them formed from semiprime digits. [Silva]

The smallest prime whose each digit as well as number of digits are all composite numbers. [Gudipati]

(There is one curio for this number that has not yet been approved by an editor.)

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell