168446321 has 2 divisors, whose sum is σ = 168446322. Its totient is φ = 168446320.

The previous prime is 168446309. The next prime is 168446329. The reversal of 168446321 is 123644861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167314225 + 1132096 = 12935^2 + 1064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168446321 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_9420974 and since 168446321 and 9420974 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (168446329) 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, 84223160 + 84223161.

It is an arithmetic number, because the mean of its divisors is an integer number (84223161).

Almost surely, 2^168446321 is an apocalyptic number.

It is an amenable number.

168446321 is a deficient number, since it is larger than the sum of its proper divisors (1).

168446321 is an equidigital number, since it uses as much as digits as its factorization.

168446321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 35.

The square root of 168446321 is about 12978.6871832247. The cubic root of 168446321 is about 552.2730404185.

The spelling of 168446321 in words is "one hundred sixty-eight million, four hundred forty-six thousand, three hundred twenty-one".