318138013 has 2 divisors, whose sum is σ = 318138014. Its totient is φ = 318138012.

The previous prime is 318137999. The next prime is 318138019. The reversal of 318138013 is 310831813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314459289 + 3678724 = 17733^2 + 1918^2 .

It is an emirp because it is prime and its reverse (310831813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318138013 - 2¹³ = 318129821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318138019) 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, 159069006 + 159069007.

It is an arithmetic number, because the mean of its divisors is an integer number (159069007).

Almost surely, 2^318138013 is an apocalyptic number.

It is an amenable number.

318138013 is a deficient number, since it is larger than the sum of its proper divisors (1).

318138013 is an equidigital number, since it uses as much as digits as its factorization.

318138013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 318138013 is about 17836.4237727186. The cubic root of 318138013 is about 682.6611501195.

Adding to 318138013 its reverse (310831813), we get a palindrome (628969826).

The spelling of 318138013 in words is "three hundred eighteen million, one hundred thirty-eight thousand, thirteen".