1817 is nontrivially palindromic in base 13.
1817 is an esthetic number in base 13, because in such base its adjacent digits differ by 1.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7181 = 43 ⋅167.
It is a cyclic number.
It is a Duffinian number.
1817 is an undulating number in base 13.
It is a plaindrome in base 6.
21817 is an apocalyptic number.
It is an amenable number.
1817 is an equidigital number, since it uses as much as digits as its factorization.
1817 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 102.
The square root of 1817 is about 42.6262829719. The cubic root of 1817 is about 12.2025794062.
Adding to 1817 its reverse (7181), we get a palindrome (8998).
The spelling of 1817 in words is "one thousand, eight hundred seventeen".