1. It is a square number.
49 = 7 x 7
2. It is the sum of first 7 odd numbers.
1 + 3 + 5 + 7 + 9 + 11 + 13 = 49
3. It is the smallest square whose digits can be separated to make two other squares.
7^2 = 49 = 4 / 9 13^2 =169 = 16 / 9
19^2 = 361 = 36 / 1 35^2 = 1225 = 1 / 225
4. Its cube ends with 49.
49^3 = 117, 649
5. If you put 48 in the middle of number 49 and its successive results, a square number will be formed each time.
4 48 9 = 67^2
44 48 89 = 667^2
444 48 889 = 6667^2
6. The reciprocal of 49 is a repeating decimal with a period of 42.
1⁄49 = 0.0204081632 6530612244 8979591836 7346938775 51
7. The atomic number of Indium is 49.
8. It is a centered octagonal number.
9. The square of 49 = 2401 whose sum 2 + 4 + 0 + 1 =7 is a square root of 49.
Dr Rajesh Kumar Thakur
rkthakur1974@gmail.com
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