Question

what is speciality of no. 153

Answer 1

It can be expressed as the sum of two squares 153=12^2+3^2It can be expressed as the sum of three pentagonal numbers. 153=1+35+117.It can be expressed as the product of two numbers formed from its own digits. 153= 3×51.It is a Harshad number. i.e. it is divisible by the sum of its own digits. 153÷ (1+5+3)=17The sum of aliquot divisors of 153 is perfect square. 1+3+9+17+51=81=9^2Also it is the square of the sum of the digits of 153. 1+3+9+17+51=81=(1+5+3)^2.

Answer 2

153 is the sum of first 17 integers and also sum of first five positive factorials.

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