128933617 has 2 divisors, whose sum is σ = 128933618. Its totient is φ = 128933616.

The previous prime is 128933587. The next prime is 128933633. The reversal of 128933617 is 716339821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121088016 + 7845601 = 11004^2 + 2801^2 .

It is an emirp because it is prime and its reverse (716339821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128933617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128933617.

It is not a weakly prime, because it can be changed into another prime (128933647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64466808 + 64466809.

It is an arithmetic number, because the mean of its divisors is an integer number (64466809).

Almost surely, 2^128933617 is an apocalyptic number.

It is an amenable number.

128933617 is a deficient number, since it is larger than the sum of its proper divisors (1).

128933617 is an equidigital number, since it uses as much as digits as its factorization.

128933617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 128933617 is about 11354.8939669202. The cubic root of 128933617 is about 505.1907484493.

The spelling of 128933617 in words is "one hundred twenty-eight million, nine hundred thirty-three thousand, six hundred seventeen".