128068517 has 2 divisors, whose sum is σ = 128068518. Its totient is φ = 128068516.

The previous prime is 128068489. The next prime is 128068529. The reversal of 128068517 is 715860821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122456356 + 5612161 = 11066^2 + 2369^2 .

It is a cyclic number.

It is not a de Polignac number, because 128068517 - 2⁶ = 128068453 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 (128068547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64034258 + 64034259.

It is an arithmetic number, because the mean of its divisors is an integer number (64034259).

Almost surely, 2^128068517 is an apocalyptic number.

It is an amenable number.

128068517 is a deficient number, since it is larger than the sum of its proper divisors (1).

128068517 is an equidigital number, since it uses as much as digits as its factorization.

128068517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 128068517 is about 11316.7361460803. The cubic root of 128068517 is about 504.0583268455.

The spelling of 128068517 in words is "one hundred twenty-eight million, sixty-eight thousand, five hundred seventeen".