1. It is a centered octagonal number.
2. It is a square number.
3. It is the smallest square number that can be written as a sum of 2 consecutive squares.
25 = 3^2 + 4^2
4. It is the sum of first 5 odd numbers. 1 + 3 + 5 + 7 + 9 = 25
5. It is the sum of two triangular numbers.
6. If you place 6 with 25 in two different ways you get two square numbers.
625 = 25^2 and 256 = 16^2
7. A number ending with 25, 50, 75 or 00 will be divisible by 25.
Example:- 450, 625, 875, 1900 are divisible by 25.
8. It is the difference of squares of two consecutive numbers.
25 = 132 – 122
9. It is the sum of squares of two consecutive numbers.
25 = 32 + 42
10. It can be portioned in 1958 ways.
11. All powers of 25 ends with 25
25^2 = 625
25^3 = 15625
12. It is the only solution of (n – 1 )! + 1 = n^k
25 = 5^2 = (5 – 1 )! + 1
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rkthakur1974@gmail.com
Dr Rajesh Kumar Thakur
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