318061309 has 2 divisors, whose sum is σ = 318061310. Its totient is φ = 318061308.

The previous prime is 318061301. The next prime is 318061343. The reversal of 318061309 is 903160813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 267224409 + 50836900 = 16347^2 + 7130^2 .

It is a cyclic number.

It is not a de Polignac number, because 318061309 - 2³ = 318061301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318061301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159030654 + 159030655.

It is an arithmetic number, because the mean of its divisors is an integer number (159030655).

Almost surely, 2^318061309 is an apocalyptic number.

It is an amenable number.

318061309 is a deficient number, since it is larger than the sum of its proper divisors (1).

318061309 is an equidigital number, since it uses as much as digits as its factorization.

318061309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 318061309 is about 17834.2734362799. The cubic root of 318061309 is about 682.6062818469.

The spelling of 318061309 in words is "three hundred eighteen million, sixty-one thousand, three hundred nine".