128995169 has 2 divisors, whose sum is σ = 128995170. Its totient is φ = 128995168.

The previous prime is 128995157. The next prime is 128995177. The reversal of 128995169 is 961599821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104857600 + 24137569 = 10240^2 + 4913^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128995169 is a prime.

It is a super-2 number, since 2×128995169² = 33279507250677122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128995129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64497584 + 64497585.

It is an arithmetic number, because the mean of its divisors is an integer number (64497585).

Almost surely, 2^128995169 is an apocalyptic number.

It is an amenable number.

128995169 is a deficient number, since it is larger than the sum of its proper divisors (1).

128995169 is an equidigital number, since it uses as much as digits as its factorization.

128995169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 50.

The square root of 128995169 is about 11357.6040166930. The cubic root of 128995169 is about 505.2711271608.

The spelling of 128995169 in words is "one hundred twenty-eight million, nine hundred ninety-five thousand, one hundred sixty-nine".