318289409 has 2 divisors, whose sum is σ = 318289410. Its totient is φ = 318289408.

The previous prime is 318289403. The next prime is 318289421. The reversal of 318289409 is 904982813.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 303735184 + 14554225 = 17428^2 + 3815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318289409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 318289409.

It is not a weakly prime, because it can be changed into another prime (318289403) 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, 159144704 + 159144705.

It is an arithmetic number, because the mean of its divisors is an integer number (159144705).

Almost surely, 2^318289409 is an apocalyptic number.

It is an amenable number.

318289409 is a deficient number, since it is larger than the sum of its proper divisors (1).

318289409 is an equidigital number, since it uses as much as digits as its factorization.

318289409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 318289409 is about 17840.6672801216. The cubic root of 318289409 is about 682.7694215543.

The spelling of 318289409 in words is "three hundred eighteen million, two hundred eighty-nine thousand, four hundred nine".