128766871 has 2 divisors, whose sum is σ = 128766872. Its totient is φ = 128766870.

The previous prime is 128766809. The next prime is 128766881. The reversal of 128766871 is 178667821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128766871 - 2⁹ = 128766359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128766881) 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, 64383435 + 64383436.

It is an arithmetic number, because the mean of its divisors is an integer number (64383436).

Almost surely, 2^128766871 is an apocalyptic number.

128766871 is a deficient number, since it is larger than the sum of its proper divisors (1).

128766871 is an equidigital number, since it uses as much as digits as its factorization.

128766871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 46.

The square root of 128766871 is about 11347.5491186423. The cubic root of 128766871 is about 504.9728717904.

The spelling of 128766871 in words is "one hundred twenty-eight million, seven hundred sixty-six thousand, eight hundred seventy-one".