13220717 has 2 divisors, whose sum is σ = 13220718. Its totient is φ = 13220716.

The previous prime is 13220687. The next prime is 13220731. The reversal of 13220717 is 71702231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13169641 + 51076 = 3629^2 + 226^2 .

It is a cyclic number.

It is not a de Polignac number, because 13220717 - 2⁸ = 13220461 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13220692 and 13220701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13220117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610358 + 6610359.

It is an arithmetic number, because the mean of its divisors is an integer number (6610359).

Almost surely, 2^13220717 is an apocalyptic number.

It is an amenable number.

13220717 is a deficient number, since it is larger than the sum of its proper divisors (1).

13220717 is an equidigital number, since it uses as much as digits as its factorization.

13220717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 13220717 is about 3636.0303904120. The cubic root of 13220717 is about 236.4567247063.

Adding to 13220717 its reverse (71702231), we get a palindrome (84922948).

The spelling of 13220717 in words is "thirteen million, two hundred twenty thousand, seven hundred seventeen".