Amazing Numbers

Just interesting information about numbers.

1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
1234 x 8 + 4 = 9876
12345 x 8 + 5 = 98765
123456 x 8 + 6 = 987654
1234567 x 8 + 7 = 9876543
12345678 x 8 + 8 = 98765432
123456789 x 8 + 9 = 987654321


Do you know the amazing number: 142 857.
When you multiply it only numerals inside the number change theirs places.

142 857 * 1 = 142 857
142 857 * 2 = 285 714
3 = 428 571
4 = 571 428
5 = 714 285
6 = 857 142

And only when you multiply it on 7 it will become 999 999.
Also, 142 + 857 = 999,

14 + 28 + 57 = 99.
And: 142 857 squared 20408122449.
20408+122449 = 142 857


111111111 * 111111111 = 12345678987654321


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