128976121 has 2 divisors, whose sum is σ = 128976122. Its totient is φ = 128976120.

The previous prime is 128976109. The next prime is 128976163. The reversal of 128976121 is 121679821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96040000 + 32936121 = 9800^2 + 5739^2 .

It is a cyclic number.

It is not a de Polignac number, because 128976121 - 2¹¹ = 128974073 is a prime.

It is not a weakly prime, because it can be changed into another prime (128976721) 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, 64488060 + 64488061.

It is an arithmetic number, because the mean of its divisors is an integer number (64488061).

Almost surely, 2^128976121 is an apocalyptic number.

It is an amenable number.

128976121 is a deficient number, since it is larger than the sum of its proper divisors (1).

128976121 is an equidigital number, since it uses as much as digits as its factorization.

128976121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 37.

The square root of 128976121 is about 11356.7654285893. The cubic root of 128976121 is about 505.2462557430.

The spelling of 128976121 in words is "one hundred twenty-eight million, nine hundred seventy-six thousand, one hundred twenty-one".