128535791 has 2 divisors, whose sum is σ = 128535792. Its totient is φ = 128535790.

The previous prime is 128535787. The next prime is 128535809. The reversal of 128535791 is 197535821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128535791 - 2² = 128535787 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 (128535721) 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, 64267895 + 64267896.

It is an arithmetic number, because the mean of its divisors is an integer number (64267896).

Almost surely, 2^128535791 is an apocalyptic number.

128535791 is a deficient number, since it is larger than the sum of its proper divisors (1).

128535791 is an equidigital number, since it uses as much as digits as its factorization.

128535791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 41.

The square root of 128535791 is about 11337.3626121775. The cubic root of 128535791 is about 504.6706227158.

The spelling of 128535791 in words is "one hundred twenty-eight million, five hundred thirty-five thousand, seven hundred ninety-one".