1220717 has 2 divisors, whose sum is σ = 1220718. Its totient is φ = 1220716.

The previous prime is 1220711. The next prime is 1220729. The reversal of 1220717 is 7170221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 729316 + 491401 = 854^2 + 701^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220717 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610358 + 610359.

It is an arithmetic number, because the mean of its divisors is an integer number (610359).

2^1220717 is an apocalyptic number.

It is an amenable number.

1220717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220717 is an equidigital number, since it uses as much as digits as its factorization.

1220717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 1220717 is about 1104.8606246944. The cubic root of 1220717 is about 106.8739015881.

Adding to 1220717 its reverse (7170221), we get a palindrome (8390938).

The spelling of 1220717 in words is "one million, two hundred twenty thousand, seven hundred seventeen".