318728717 has 2 divisors, whose sum is σ = 318728718. Its totient is φ = 318728716.

The previous prime is 318728713. The next prime is 318728723. The reversal of 318728717 is 717827813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318479716 + 249001 = 17846^2 + 499^2 .

It is a cyclic number.

It is not a de Polignac number, because 318728717 - 2² = 318728713 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318728713) 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, 159364358 + 159364359.

It is an arithmetic number, because the mean of its divisors is an integer number (159364359).

Almost surely, 2^318728717 is an apocalyptic number.

It is an amenable number.

318728717 is a deficient number, since it is larger than the sum of its proper divisors (1).

318728717 is an equidigital number, since it uses as much as digits as its factorization.

318728717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131712, while the sum is 44.

The square root of 318728717 is about 17852.9750181867. The cubic root of 318728717 is about 683.0834001426.

The spelling of 318728717 in words is "three hundred eighteen million, seven hundred twenty-eight thousand, seven hundred seventeen".