318668881 has 2 divisors, whose sum is σ = 318668882. Its totient is φ = 318668880.

The previous prime is 318668879. The next prime is 318668891. The reversal of 318668881 is 188866813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231526656 + 87142225 = 15216^2 + 9335^2 .

It is a cyclic number.

It is not a de Polignac number, because 318668881 - 2¹ = 318668879 is a prime.

It is a super-2 number, since 2×318668881² = 203099711435584322, which contains 22 as substring.

Together with 318668879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (318668891) 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, 159334440 + 159334441.

It is an arithmetic number, because the mean of its divisors is an integer number (159334441).

Almost surely, 2^318668881 is an apocalyptic number.

It is an amenable number.

318668881 is a deficient number, since it is larger than the sum of its proper divisors (1).

318668881 is an equidigital number, since it uses as much as digits as its factorization.

318668881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 442368, while the sum is 49.

The square root of 318668881 is about 17851.2991403987. The cubic root of 318668881 is about 683.0406516294.

The spelling of 318668881 in words is "three hundred eighteen million, six hundred sixty-eight thousand, eight hundred eighty-one".