168985717 has 2 divisors, whose sum is σ = 168985718. Its totient is φ = 168985716.

The previous prime is 168985711. The next prime is 168985769. The reversal of 168985717 is 717589861.

It is an a-pointer prime, because the next prime (168985769) can be obtained adding 168985717 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166952241 + 2033476 = 12921^2 + 1426^2 .

It is a cyclic number.

It is not a de Polignac number, because 168985717 - 2³ = 168985709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168985711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84492858 + 84492859.

It is an arithmetic number, because the mean of its divisors is an integer number (84492859).

Almost surely, 2^168985717 is an apocalyptic number.

It is an amenable number.

168985717 is a deficient number, since it is larger than the sum of its proper divisors (1).

168985717 is an equidigital number, since it uses as much as digits as its factorization.

168985717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 52.

The square root of 168985717 is about 12999.4506422387. The cubic root of 168985717 is about 552.8619054871.

The spelling of 168985717 in words is "one hundred sixty-eight million, nine hundred eighty-five thousand, seven hundred seventeen".