168440917 has 2 divisors, whose sum is σ = 168440918. Its totient is φ = 168440916.

The previous prime is 168440911. The next prime is 168440939. The reversal of 168440917 is 719044861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168117156 + 323761 = 12966^2 + 569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168440917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168440917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168440911) 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, 84220458 + 84220459.

It is an arithmetic number, because the mean of its divisors is an integer number (84220459).

Almost surely, 2^168440917 is an apocalyptic number.

It is an amenable number.

168440917 is a deficient number, since it is larger than the sum of its proper divisors (1).

168440917 is an equidigital number, since it uses as much as digits as its factorization.

168440917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 168440917 is about 12978.4789940886. The cubic root of 168440917 is about 552.2671344512.

The spelling of 168440917 in words is "one hundred sixty-eight million, four hundred forty thousand, nine hundred seventeen".