128027609 has 2 divisors, whose sum is σ = 128027610. Its totient is φ = 128027608.

The previous prime is 128027587. The next prime is 128027617. The reversal of 128027609 is 906720821.

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., 117787609 + 10240000 = 10853^2 + 3200^2 .

It is an emirp because it is prime and its reverse (906720821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128027609 - 2⁸ = 128027353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128027639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64013804 + 64013805.

It is an arithmetic number, because the mean of its divisors is an integer number (64013805).

Almost surely, 2^128027609 is an apocalyptic number.

It is an amenable number.

128027609 is a deficient number, since it is larger than the sum of its proper divisors (1).

128027609 is an equidigital number, since it uses as much as digits as its factorization.

128027609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 128027609 is about 11314.9285901414. The cubic root of 128027609 is about 504.0046518950.

The spelling of 128027609 in words is "one hundred twenty-eight million, twenty-seven thousand, six hundred nine".