168893321 has 2 divisors, whose sum is σ = 168893322. Its totient is φ = 168893320.

The previous prime is 168893269. The next prime is 168893327. The reversal of 168893321 is 123398861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145467721 + 23425600 = 12061^2 + 4840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168893321 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (168893327) 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, 84446660 + 84446661.

It is an arithmetic number, because the mean of its divisors is an integer number (84446661).

Almost surely, 2^168893321 is an apocalyptic number.

It is an amenable number.

168893321 is a deficient number, since it is larger than the sum of its proper divisors (1).

168893321 is an equidigital number, since it uses as much as digits as its factorization.

168893321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 168893321 is about 12995.8963138369. The cubic root of 168893321 is about 552.7611246985.

The spelling of 168893321 in words is "one hundred sixty-eight million, eight hundred ninety-three thousand, three hundred twenty-one".