128967121 has 2 divisors, whose sum is σ = 128967122. Its totient is φ = 128967120.

The previous prime is 128967109. The next prime is 128967127. The reversal of 128967121 is 121769821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116640000 + 12327121 = 10800^2 + 3511^2 .

It is a cyclic number.

It is not a de Polignac number, because 128967121 - 2¹⁵ = 128934353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128967127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64483560 + 64483561.

It is an arithmetic number, because the mean of its divisors is an integer number (64483561).

Almost surely, 2^128967121 is an apocalyptic number.

It is an amenable number.

128967121 is a deficient number, since it is larger than the sum of its proper divisors (1).

128967121 is an equidigital number, since it uses as much as digits as its factorization.

128967121 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 128967121 is about 11356.3691820934. The cubic root of 128967121 is about 505.2345033813.

The spelling of 128967121 in words is "one hundred twenty-eight million, nine hundred sixty-seven thousand, one hundred twenty-one".