128442911 has 2 divisors, whose sum is σ = 128442912. Its totient is φ = 128442910.

The previous prime is 128442877. The next prime is 128442929. The reversal of 128442911 is 119244821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128442911 - 2²⁶ = 61334047 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128442011) 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, 64221455 + 64221456.

It is an arithmetic number, because the mean of its divisors is an integer number (64221456).

Almost surely, 2^128442911 is an apocalyptic number.

128442911 is a deficient number, since it is larger than the sum of its proper divisors (1).

128442911 is an equidigital number, since it uses as much as digits as its factorization.

128442911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 32.

The square root of 128442911 is about 11333.2656811706. The cubic root of 128442911 is about 504.5490350450.

The spelling of 128442911 in words is "one hundred twenty-eight million, four hundred forty-two thousand, nine hundred eleven".