68129917 has 2 divisors, whose sum is σ = 68129918. Its totient is φ = 68129916.

The previous prime is 68129869. The next prime is 68129923. The reversal of 68129917 is 71992186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52041796 + 16088121 = 7214^2 + 4011^2 .

It is a cyclic number.

It is not a de Polignac number, because 68129917 - 2¹¹ = 68127869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68129927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34064958 + 34064959.

It is an arithmetic number, because the mean of its divisors is an integer number (34064959).

Almost surely, 2^68129917 is an apocalyptic number.

It is an amenable number.

68129917 is a deficient number, since it is larger than the sum of its proper divisors (1).

68129917 is an equidigital number, since it uses as much as digits as its factorization.

68129917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 43.

The square root of 68129917 is about 8254.0848675065. The cubic root of 68129917 is about 408.4252842302.

The spelling of 68129917 in words is "sixty-eight million, one hundred twenty-nine thousand, nine hundred seventeen".