168752321 has 2 divisors, whose sum is σ = 168752322. Its totient is φ = 168752320.

The previous prime is 168752299. The next prime is 168752323. The reversal of 168752321 is 123257861.

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., 137827600 + 30924721 = 11740^2 + 5561^2 .

It is an emirp because it is prime and its reverse (123257861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168752321 - 2⁶ = 168752257 is a prime.

Together with 168752323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (168752323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84376160 + 84376161.

It is an arithmetic number, because the mean of its divisors is an integer number (84376161).

Almost surely, 2^168752321 is an apocalyptic number.

It is an amenable number.

168752321 is a deficient number, since it is larger than the sum of its proper divisors (1).

168752321 is an equidigital number, since it uses as much as digits as its factorization.

168752321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 168752321 is about 12990.4703917911. The cubic root of 168752321 is about 552.6072583065.

The spelling of 168752321 in words is "one hundred sixty-eight million, seven hundred fifty-two thousand, three hundred twenty-one".