68731717 has 2 divisors, whose sum is σ = 68731718. Its totient is φ = 68731716.

The previous prime is 68731709. The next prime is 68731753. The reversal of 68731717 is 71713786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48427681 + 20304036 = 6959^2 + 4506^2 .

It is a cyclic number.

It is not a de Polignac number, because 68731717 - 2³ = 68731709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68731717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68731777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34365858 + 34365859.

It is an arithmetic number, because the mean of its divisors is an integer number (34365859).

Almost surely, 2^68731717 is an apocalyptic number.

It is an amenable number.

68731717 is a deficient number, since it is larger than the sum of its proper divisors (1).

68731717 is an equidigital number, since it uses as much as digits as its factorization.

68731717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 40.

The square root of 68731717 is about 8290.4593961975. The cubic root of 68731717 is about 409.6243177758.

The spelling of 68731717 in words is "sixty-eight million, seven hundred thirty-one thousand, seven hundred seventeen".