no. 1986 upside down is 1689
Sort of - it's been rotated by 180 degrees. if it was simply flipped, it would read 8ee1
Yes, if you were to flip 1966 upside down it would be 1999.
1961 was the last year that read the same upside down and right side up. After 1961, the next year that will satisfy this condition is 6009.
1961 can be read the same way right side up and upside down.
1913
1961
1961
1998
The year that can be read right side up and upside down is 1991. When flipped, the digits remain unchanged and still read as 1991. Neither 1990 nor 1999 has that property.
It was a topsy - turvy year! 1881 - 1881 Turn the year upside down and you'll see!
1961
The year 1961 remains unchanged when flipped upside down, as the numbers 1 and 6 look the same even when inverted. This characteristic makes it an interesting example of a visually symmetrical year. Other years, such as 1881 or 2002, also exhibit this property.