128192717 has 2 divisors, whose sum is σ = 128192718. Its totient is φ = 128192716.

The previous prime is 128192711. The next prime is 128192759. The reversal of 128192717 is 717291821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114789796 + 13402921 = 10714^2 + 3661^2 .

It is an emirp because it is prime and its reverse (717291821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128192717 - 2⁶ = 128192653 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 (128192711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64096358 + 64096359.

It is an arithmetic number, because the mean of its divisors is an integer number (64096359).

Almost surely, 2^128192717 is an apocalyptic number.

It is an amenable number.

128192717 is a deficient number, since it is larger than the sum of its proper divisors (1).

128192717 is an equidigital number, since it uses as much as digits as its factorization.

128192717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 38.

The square root of 128192717 is about 11322.2222642024. Note that the first 4 decimals coincide. The cubic root of 128192717 is about 504.2212183427.

The spelling of 128192717 in words is "one hundred twenty-eight million, one hundred ninety-two thousand, seven hundred seventeen".