128170117 has 2 divisors, whose sum is σ = 128170118. Its totient is φ = 128170116.

The previous prime is 128170079. The next prime is 128170241. The reversal of 128170117 is 711071821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82283041 + 45887076 = 9071^2 + 6774^2 .

It is an emirp because it is prime and its reverse (711071821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128170117 - 2⁷ = 128169989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128170817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64085058 + 64085059.

It is an arithmetic number, because the mean of its divisors is an integer number (64085059).

Almost surely, 2^128170117 is an apocalyptic number.

It is an amenable number.

128170117 is a deficient number, since it is larger than the sum of its proper divisors (1).

128170117 is an equidigital number, since it uses as much as digits as its factorization.

128170117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 28.

The square root of 128170117 is about 11321.2241829230. The cubic root of 128170117 is about 504.1915856939.

The spelling of 128170117 in words is "one hundred twenty-eight million, one hundred seventy thousand, one hundred seventeen".