318717613 has 2 divisors, whose sum is σ = 318717614. Its totient is φ = 318717612.

The previous prime is 318717611. The next prime is 318717617. The reversal of 318717613 is 316717813.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253382724 + 65334889 = 15918^2 + 8083^2 .

It is an emirp because it is prime and its reverse (316717813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318717613 - 2¹ = 318717611 is a prime.

Together with 318717611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318717611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159358806 + 159358807.

It is an arithmetic number, because the mean of its divisors is an integer number (159358807).

Almost surely, 2^318717613 is an apocalyptic number.

It is an amenable number.

318717613 is a deficient number, since it is larger than the sum of its proper divisors (1).

318717613 is an equidigital number, since it uses as much as digits as its factorization.

318717613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 318717613 is about 17852.6640308947. The cubic root of 318717613 is about 683.0754675386.

The spelling of 318717613 in words is "three hundred eighteen million, seven hundred seventeen thousand, six hundred thirteen".