68319613 has 2 divisors, whose sum is σ = 68319614. Its totient is φ = 68319612.

The previous prime is 68319599. The next prime is 68319661. The reversal of 68319613 is 31691386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61121124 + 7198489 = 7818^2 + 2683^2 .

It is a cyclic number.

It is not a de Polignac number, because 68319613 - 2⁹ = 68319101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68319113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34159806 + 34159807.

It is an arithmetic number, because the mean of its divisors is an integer number (34159807).

Almost surely, 2^68319613 is an apocalyptic number.

It is an amenable number.

68319613 is a deficient number, since it is larger than the sum of its proper divisors (1).

68319613 is an equidigital number, since it uses as much as digits as its factorization.

68319613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 68319613 is about 8265.5679175723. The cubic root of 68319613 is about 408.8039962085.

The spelling of 68319613 in words is "sixty-eight million, three hundred nineteen thousand, six hundred thirteen".