128203129 has 2 divisors, whose sum is σ = 128203130. Its totient is φ = 128203128.

The previous prime is 128203109. The next prime is 128203157. The reversal of 128203129 is 921302821.

It is an a-pointer prime, because the next prime (128203157) can be obtained adding 128203129 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68558400 + 59644729 = 8280^2 + 7723^2 .

It is a cyclic number.

It is not a de Polignac number, because 128203129 - 2⁹ = 128202617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128203097 and 128203106.

It is not a weakly prime, because it can be changed into another prime (128203109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64101564 + 64101565.

It is an arithmetic number, because the mean of its divisors is an integer number (64101565).

Almost surely, 2^128203129 is an apocalyptic number.

It is an amenable number.

128203129 is a deficient number, since it is larger than the sum of its proper divisors (1).

128203129 is an equidigital number, since it uses as much as digits as its factorization.

128203129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 128203129 is about 11322.6820585937. The cubic root of 128203129 is about 504.2348691681.

The spelling of 128203129 in words is "one hundred twenty-eight million, two hundred three thousand, one hundred twenty-nine".