318940109 has 2 divisors, whose sum is σ = 318940110. Its totient is φ = 318940108.

The previous prime is 318940093. The next prime is 318940117. The reversal of 318940109 is 901049813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 308986084 + 9954025 = 17578^2 + 3155^2 .

It is a cyclic number.

It is not a de Polignac number, because 318940109 - 2⁴ = 318940093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318940309) 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, 159470054 + 159470055.

It is an arithmetic number, because the mean of its divisors is an integer number (159470055).

Almost surely, 2^318940109 is an apocalyptic number.

It is an amenable number.

318940109 is a deficient number, since it is larger than the sum of its proper divisors (1).

318940109 is an equidigital number, since it uses as much as digits as its factorization.

318940109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 318940109 is about 17858.8943946707. The cubic root of 318940109 is about 683.2343816794.

The spelling of 318940109 in words is "three hundred eighteen million, nine hundred forty thousand, one hundred nine".