## Happy Casual π Day!

### Properties of the number 7222017:

7222017 is a cyclic number.7222017 = 3 × 11 × 218849 is a sphenic number and squarefree.

7222017 has 3 distinct prime factors, 8 divisors, 11 antidivisors and 4376960 totatives.

7222017 has a semiprime digit sum 21 in base 10.

7222017 has a Fibonacci digit sum 21 in base 10.

7222017 has a triangular digit sum 21 in base 10.

7222017 = 3611009

^{2}- 3611008

^{2}= 1203671

^{2}- 1203668

^{2}= 328279

^{2}- 328268

^{2}= 109441

^{2}- 109408

^{2}is the difference of 2 nonnegative squares in 4 ways.

7222017 is the difference of 2 positive pentagonal numbers in 2 ways.

7222017 = 53

^{2}+ 218

^{2}+ 2678

^{2}is the sum of 3 positive squares.

7222017

^{2}= 3016200

^{2}+ 6562017

^{2}is the sum of 2 positive squares in 1 way.

7222017

^{2}is the sum of 3 positive squares.

7222017 is a proper divisor of 397

^{6839}- 1.

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