#numbers
2025 is a perfect square. Didn't occur since 1936 and won’t until 2116. Adding 1 to each digit gives a perfect square- 25 is the only smaller integer with this property
It is sum of cubes of the first 9 integers and the square of their sum
1³+2³+3³+4³+5³+6³+7³+8³+9³=(1+2+3+4+5+6+7+8+9)²