128170897 has 2 divisors, whose sum is σ = 128170898. Its totient is φ = 128170896.

The previous prime is 128170883. The next prime is 128170909. The reversal of 128170897 is 798071821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85673536 + 42497361 = 9256^2 + 6519^2 .

It is an emirp because it is prime and its reverse (798071821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128170897 is a prime.

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, 64085448 + 64085449.

It is an arithmetic number, because the mean of its divisors is an integer number (64085449).

Almost surely, 2^128170897 is an apocalyptic number.

It is an amenable number.

128170897 is a deficient number, since it is larger than the sum of its proper divisors (1).

128170897 is an equidigital number, since it uses as much as digits as its factorization.

128170897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 128170897 is about 11321.2586314420. The cubic root of 128170897 is about 504.1926084717.

The spelling of 128170897 in words is "one hundred twenty-eight million, one hundred seventy thousand, eight hundred ninety-seven".