128578129 has 2 divisors, whose sum is σ = 128578130. Its totient is φ = 128578128.

The previous prime is 128578117. The next prime is 128578181. The reversal of 128578129 is 921875821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76160529 + 52417600 = 8727^2 + 7240^2 .

It is an emirp because it is prime and its reverse (921875821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128578129 - 2⁵ = 128578097 is a prime.

It is not a weakly prime, because it can be changed into another prime (128573129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64289064 + 64289065.

It is an arithmetic number, because the mean of its divisors is an integer number (64289065).

Almost surely, 2^128578129 is an apocalyptic number.

It is an amenable number.

128578129 is a deficient number, since it is larger than the sum of its proper divisors (1).

128578129 is an equidigital number, since it uses as much as digits as its factorization.

128578129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 43.

The square root of 128578129 is about 11339.2296475554. The cubic root of 128578129 is about 504.7260272562.

The spelling of 128578129 in words is "one hundred twenty-eight million, five hundred seventy-eight thousand, one hundred twenty-nine".