168971717 has 2 divisors, whose sum is σ = 168971718. Its totient is φ = 168971716.

The previous prime is 168971707. The next prime is 168971723. The reversal of 168971717 is 717179861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163047361 + 5924356 = 12769^2 + 2434^2 .

It is a cyclic number.

It is not a de Polignac number, because 168971717 - 2¹⁸ = 168709573 is a prime.

It is a super-2 number, since 2×168971717² = 57102882291856178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168971707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84485858 + 84485859.

It is an arithmetic number, because the mean of its divisors is an integer number (84485859).

Almost surely, 2^168971717 is an apocalyptic number.

It is an amenable number.

168971717 is a deficient number, since it is larger than the sum of its proper divisors (1).

168971717 is an equidigital number, since it uses as much as digits as its factorization.

168971717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148176, while the sum is 47.

The square root of 168971717 is about 12998.9121467914. The cubic root of 168971717 is about 552.8466373714.

The spelling of 168971717 in words is "one hundred sixty-eight million, nine hundred seventy-one thousand, seven hundred seventeen".