128321597 has 2 divisors, whose sum is σ = 128321598. Its totient is φ = 128321596.

The previous prime is 128321551. The next prime is 128321629. The reversal of 128321597 is 795123821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124858276 + 3463321 = 11174^2 + 1861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128321597 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128321597.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128321507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64160798 + 64160799.

It is an arithmetic number, because the mean of its divisors is an integer number (64160799).

Almost surely, 2^128321597 is an apocalyptic number.

It is an amenable number.

128321597 is a deficient number, since it is larger than the sum of its proper divisors (1).

128321597 is an equidigital number, since it uses as much as digits as its factorization.

128321597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 128321597 is about 11327.9122966238. The cubic root of 128321597 is about 504.3901365850.

The spelling of 128321597 in words is "one hundred twenty-eight million, three hundred twenty-one thousand, five hundred ninety-seven".