318349609 has 2 divisors, whose sum is σ = 318349610. Its totient is φ = 318349608.

The previous prime is 318349607. The next prime is 318349613. The reversal of 318349609 is 906943813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313821225 + 4528384 = 17715^2 + 2128^2 .

It is an emirp because it is prime and its reverse (906943813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318349609 - 2¹ = 318349607 is a prime.

Together with 318349607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (318349607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159174804 + 159174805.

It is an arithmetic number, because the mean of its divisors is an integer number (159174805).

Almost surely, 2^318349609 is an apocalyptic number.

It is an amenable number.

318349609 is a deficient number, since it is larger than the sum of its proper divisors (1).

318349609 is an equidigital number, since it uses as much as digits as its factorization.

318349609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 318349609 is about 17842.3543569788. The cubic root of 318349609 is about 682.8124642767.

The spelling of 318349609 in words is "three hundred eighteen million, three hundred forty-nine thousand, six hundred nine".