This number is a prime.
1409 contains no prime digits. π(1409) equals 223 and contains all prime
digits. π(223) equals 48 with no prime digits. Note that 1409 is the smallest prime with this property. [Punches]
The smallest emirp whose digits are distinct square digits.
Note that its reversal is the largest such emirp. [Loungrides]
Your best chance of being born in a prime number year in the past millennium was to have been born in the 15th century (17 prime number years, from 1409 to 1499). [Tammet]
The first emirp p such that 2p+1, 3p+2, and 4p+3 are prime. [Loungrides]
The only known number whose 8th power can be
written as the sum of eight 8th powers. [Gudipati]
The smallest emirp such that the emirp pair are PIPs [Prime-Indexed Primes]. E.g., 1409 is the 223rd prime and 9041 is the 1123rd prime. Both 223 and 1123 are prime. Emirpips? [Green]
Each of the states North Dakota, Rhode Island, and Wyoming have just one area code for the state and they are 701,
401, 307, respectively, and each is a prime. Curiously, the sum of the three codes is an emirp (which happens to be a twin prime). [Green]
The smallest prime p such that 2p+1, 3p+2, 4p+3 are prime. [Loungrides]
The first multidigit prime (emirp) in the sequence of
pentanacci numbers whose predermined terms are the odd
The 46th Sophie Germain prime (1409) divides the sum of the
first 46 primes (4227). [Gaydos]
The smallest emirp p with a prime index such that
reversal(p) is also a prime with a prime index. [Sariyar]
The first composite Fibonacci "hole"
occurs at F1409.
A prime number of the form 3n2 + 3n + 23, where n = 21. [Maloth]
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