It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3431 = 47 ⋅73.
It is a cyclic number.
It is a Duffinian number.
It is a plaindrome in base 8 and base 14.
It is a congruent number.
21343 is an apocalyptic number.
1343 is an equidigital number, since it uses as much as digits as its factorization.
1343 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 96.
The square root of 1343 is about 36.6469644036. The cubic root of 1343 is about 11.0329589985.
Adding to 1343 its reverse (3431), we get a palindrome (4774).
The spelling of 1343 in words is "one thousand, three hundred forty-three", and thus it is an iban number.