It is a semiprime because it is the product of two primes.
It is an Ulam number.
It is a Duffinian number.
It is a plaindrome in base 10.
It is an unprimeable number.
1355 is an equidigital number, since it uses as much as digits as its factorization.
1355 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 276.
The square root of 1355 is about 36.8103246386. The cubic root of 1355 is about 11.0657222465.
Adding to 1355 its sum of digits (14), we get a square (1369 = 372).
Adding to 1355 its reverse (5531), we get a palindrome (6886).
The spelling of 1355 in words is "one thousand, three hundred fifty-five".