318721163 has 2 divisors, whose sum is σ = 318721164. Its totient is φ = 318721162.

The previous prime is 318721141. The next prime is 318721177. The reversal of 318721163 is 361127813.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 318721163 - 2¹⁴ = 318704779 is a prime.

It is not a weakly prime, because it can be changed into another prime (318721103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159360581 + 159360582.

It is an arithmetic number, because the mean of its divisors is an integer number (159360582).

Almost surely, 2^318721163 is an apocalyptic number.

318721163 is a deficient number, since it is larger than the sum of its proper divisors (1).

318721163 is an equidigital number, since it uses as much as digits as its factorization.

318721163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 318721163 is about 17852.7634555550. The cubic root of 318721163 is about 683.0780036487.

Adding to 318721163 its reverse (361127813), we get a palindrome (679848976).

The spelling of 318721163 in words is "three hundred eighteen million, seven hundred twenty-one thousand, one hundred sixty-three".