128597321 has 4 divisors (see below), whose sum is σ = 130516752. Its totient is φ = 126677892.

The previous prime is 128597297. The next prime is 128597351. The reversal of 128597321 is 123795821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128597321 - 2²² = 124403017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128597351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959615 + ... + 959748.

It is an arithmetic number, because the mean of its divisors is an integer number (32629188).

Almost surely, 2^128597321 is an apocalyptic number.

It is an amenable number.

128597321 is a deficient number, since it is larger than the sum of its proper divisors (1919431).

128597321 is an equidigital number, since it uses as much as digits as its factorization.

128597321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919430.

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

The square root of 128597321 is about 11340.0758815803. The cubic root of 128597321 is about 504.7511383698.

The spelling of 128597321 in words is "one hundred twenty-eight million, five hundred ninety-seven thousand, three hundred twenty-one".