128597009 has 2 divisors, whose sum is σ = 128597010. Its totient is φ = 128597008.

The previous prime is 128597003. The next prime is 128597017. The reversal of 128597009 is 900795821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65044225 + 63552784 = 8065^2 + 7972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128597009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128597003) 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, 64298504 + 64298505.

It is an arithmetic number, because the mean of its divisors is an integer number (64298505).

Almost surely, 2^128597009 is an apocalyptic number.

It is an amenable number.

128597009 is a deficient number, since it is larger than the sum of its proper divisors (1).

128597009 is an equidigital number, since it uses as much as digits as its factorization.

128597009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 128597009 is about 11340.0621250503. The cubic root of 128597009 is about 504.7507301641.

The spelling of 128597009 in words is "one hundred twenty-eight million, five hundred ninety-seven thousand, nine".