128442659 has 2 divisors, whose sum is σ = 128442660. Its totient is φ = 128442658.

The previous prime is 128442631. The next prime is 128442731. The reversal of 128442659 is 956244821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128442659 - 2²⁰ = 127394083 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128442959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64221329 + 64221330.

It is an arithmetic number, because the mean of its divisors is an integer number (64221330).

Almost surely, 2^128442659 is an apocalyptic number.

128442659 is a deficient number, since it is larger than the sum of its proper divisors (1).

128442659 is an equidigital number, since it uses as much as digits as its factorization.

128442659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 41.

The square root of 128442659 is about 11333.2545634518. The cubic root of 128442659 is about 504.5487050763.

The spelling of 128442659 in words is "one hundred twenty-eight million, four hundred forty-two thousand, six hundred fifty-nine".