318409943 has 2 divisors, whose sum is σ = 318409944. Its totient is φ = 318409942.

The previous prime is 318409939. The next prime is 318409963. The reversal of 318409943 is 349904813.

It is a weak prime.

It is an emirp because it is prime and its reverse (349904813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318409943 - 2² = 318409939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 318409943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318409933) 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, 159204971 + 159204972.

It is an arithmetic number, because the mean of its divisors is an integer number (159204972).

Almost surely, 2^318409943 is an apocalyptic number.

318409943 is a deficient number, since it is larger than the sum of its proper divisors (1).

318409943 is an equidigital number, since it uses as much as digits as its factorization.

318409943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 318409943 is about 17844.0450290846. The cubic root of 318409943 is about 682.8555973646.

The spelling of 318409943 in words is "three hundred eighteen million, four hundred nine thousand, nine hundred forty-three".