168316321 has 4 divisors (see below), whose sum is σ = 171169200. Its totient is φ = 165463444.

The previous prime is 168316301. The next prime is 168316327. The reversal of 168316321 is 123613861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 168316321 - 2²¹ = 166219169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168316327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1426351 + ... + 1426468.

It is an arithmetic number, because the mean of its divisors is an integer number (42792300).

Almost surely, 2^168316321 is an apocalyptic number.

It is an amenable number.

168316321 is a deficient number, since it is larger than the sum of its proper divisors (2852879).

168316321 is an equidigital number, since it uses as much as digits as its factorization.

168316321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2852878.

The product of its digits is 5184, while the sum is 31.

The square root of 168316321 is about 12973.6780058702. The cubic root of 168316321 is about 552.1309299184.

The spelling of 168316321 in words is "one hundred sixty-eight million, three hundred sixteen thousand, three hundred twenty-one".