8128129 has 2 divisors, whose sum is σ = 8128130. Its totient is φ = 8128128.

The previous prime is 8128117. The next prime is 8128147. The reversal of 8128129 is 9218218.

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., 6385729 + 1742400 = 2527^2 + 1320^2 .

It is a cyclic number.

It is not a de Polignac number, because 8128129 - 2⁹ = 8127617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8128129.

It is not a weakly prime, because it can be changed into another prime (8128829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4064064 + 4064065.

It is an arithmetic number, because the mean of its divisors is an integer number (4064065).

Almost surely, 2^8128129 is an apocalyptic number.

It is an amenable number.

8128129 is a deficient number, since it is larger than the sum of its proper divisors (1).

8128129 is an equidigital number, since it uses as much as digits as its factorization.

8128129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 31.

The square root of 8128129 is about 2850.9873728237. The cubic root of 8128129 is about 201.0620914910.

The spelling of 8128129 in words is "eight million, one hundred twenty-eight thousand, one hundred twenty-nine".