Adding to 1265 its reverse (5621), we get a palindrome (6886).
Subtracting 1265 from its reverse (5621), we obtain a square (4356 = 662).
1265 is nontrivially palindromic in base 4 and base 15.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a Duffinian number.
1265 is an undulating number in base 15.
It is a Curzon number.
It is a plaindrome in base 7.
It is a nialpdrome in base 11, base 13 and base 14.
It is an unprimeable number.
21265 is an apocalyptic number.
It is an amenable number.
1265 is a wasteful number, since it uses less digits than its factorization.
1265 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 39.
The square root of 1265 is about 35.5668384876. The cubic root of 1265 is about 10.8150909291.
The spelling of 1265 in words is "one thousand, two hundred sixty-five".