318645281 has 2 divisors, whose sum is σ = 318645282. Its totient is φ = 318645280.

The previous prime is 318645241. The next prime is 318645329. The reversal of 318645281 is 182546813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202350625 + 116294656 = 14225^2 + 10784^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318645281 is a prime.

It is a super-2 number, since 2×318645281² = 203069630207137922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (318645241) 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, 159322640 + 159322641.

It is an arithmetic number, because the mean of its divisors is an integer number (159322641).

Almost surely, 2^318645281 is an apocalyptic number.

It is an amenable number.

318645281 is a deficient number, since it is larger than the sum of its proper divisors (1).

318645281 is an equidigital number, since it uses as much as digits as its factorization.

318645281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 38.

The square root of 318645281 is about 17850.6381118435. The cubic root of 318645281 is about 683.0237896573.

The spelling of 318645281 in words is "three hundred eighteen million, six hundred forty-five thousand, two hundred eighty-one".