128875517 has 2 divisors, whose sum is σ = 128875518. Its totient is φ = 128875516.

The previous prime is 128875501. The next prime is 128875541. The reversal of 128875517 is 715578821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77193796 + 51681721 = 8786^2 + 7189^2 .

It is an emirp because it is prime and its reverse (715578821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128875517 - 2⁴ = 128875501 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 (128875547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64437758 + 64437759.

It is an arithmetic number, because the mean of its divisors is an integer number (64437759).

Almost surely, 2^128875517 is an apocalyptic number.

It is an amenable number.

128875517 is a deficient number, since it is larger than the sum of its proper divisors (1).

128875517 is an equidigital number, since it uses as much as digits as its factorization.

128875517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 156800, while the sum is 44.

The square root of 128875517 is about 11352.3353104108. The cubic root of 128875517 is about 505.1148541168.

The spelling of 128875517 in words is "one hundred twenty-eight million, eight hundred seventy-five thousand, five hundred seventeen".