820342717 has 2 divisors, whose sum is σ = 820342718. Its totient is φ = 820342716.

The previous prime is 820342703. The next prime is 820342723. The reversal of 820342717 is 717243028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 813732676 + 6610041 = 28526^2 + 2571^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820342717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820343717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410171358 + 410171359.

It is an arithmetic number, because the mean of its divisors is an integer number (410171359).

Almost surely, 2^820342717 is an apocalyptic number.

It is an amenable number.

820342717 is a deficient number, since it is larger than the sum of its proper divisors (1).

820342717 is an equidigital number, since it uses as much as digits as its factorization.

820342717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 820342717 is about 28641.6255998154. The cubic root of 820342717 is about 936.1205424203.

The spelling of 820342717 in words is "eight hundred twenty million, three hundred forty-two thousand, seven hundred seventeen".