UselessFacts

Any number composed solely of the digit 1 (e.g., 1, 11, 111) that falls between 1 and 111,111,111 squared will yield a palindromic number (a number that reads the same forwards and backwards). For example: 111,111,111 x 111,111,111 = 12345678987654321.

Another property is that any palindromic number with an even number of digits (e.g., 4 digits 5665 ) is divisible by 11, and the result of the division will also be a palindromic number. For example: if we divide the number 2234554322 by 11, we get the result 203141302.

Any number composed solely of the digit 1 (e.g., 1, 11, 111) that falls between 1 and 111,111,111 squared will yield a palindromic number (a number that reads the same forwards and backwards). For example: 111,111,111 x 111,111,111 = 12345678987654321.

Another property is that any palindromic number with an even number of digits (e.g., 4 digits 5665 ) is divisible by 11, and the result of the division will also be a palindromic number. For example: if we divide the number 2234554322 by 11, we get the result 203141302.

https://en.wikipedia.org/wiki/Palindrome