7181 is nontrivially palindromic in base 4.
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 an emirpimes, since its reverse is a distinct semiprime: 1817 = 23 ⋅79.
It is a cyclic number.
It is a Duffinian number.
It is a plaindrome in base 14.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 7181.
27181 is an apocalyptic number.
It is an amenable number.
7181 is a wasteful number, since it uses less digits than its factorization.
7181 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 210.
The square root of 7181 is about 84.7407812095. The cubic root of 7181 is about 19.2927872679.
Adding to 7181 its reverse (1817), we get a palindrome (8998).
The spelling of 7181 in words is "seven thousand, one hundred eighty-one".