168968509 has 2 divisors, whose sum is σ = 168968510. Its totient is φ = 168968508.

The previous prime is 168968489. The next prime is 168968521. The reversal of 168968509 is 905869861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95609284 + 73359225 = 9778^2 + 8565^2 .

It is a cyclic number.

It is not a de Polignac number, because 168968509 - 2¹³ = 168960317 is a prime.

It is a super-3 number, since 3×168968509³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168968599) 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, 84484254 + 84484255.

It is an arithmetic number, because the mean of its divisors is an integer number (84484255).

Almost surely, 2^168968509 is an apocalyptic number.

It is an amenable number.

168968509 is a deficient number, since it is larger than the sum of its proper divisors (1).

168968509 is an equidigital number, since it uses as much as digits as its factorization.

168968509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 52.

The square root of 168968509 is about 12998.7887512645. The cubic root of 168968509 is about 552.8431386730.

The spelling of 168968509 in words is "one hundred sixty-eight million, nine hundred sixty-eight thousand, five hundred nine".