128135005 has 4 divisors (see below), whose sum is σ = 153762012. Its totient is φ = 102508000.

The previous prime is 128134949. The next prime is 128135011. The reversal of 128135005 is 500531821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48818169 + 79316836 = 6987^2 + 8906^2 .

It is not a de Polignac number, because 128135005 - 2²¹ = 126037853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 12813496 + ... + 12813505.

It is an arithmetic number, because the mean of its divisors is an integer number (38440503).

Almost surely, 2^128135005 is an apocalyptic number.

It is an amenable number.

128135005 is a deficient number, since it is larger than the sum of its proper divisors (25627007).

128135005 is an equidigital number, since it uses as much as digits as its factorization.

128135005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25627006.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 128135005 is about 11319.6733610118. The cubic root of 128135005 is about 504.1455406610.

Adding to 128135005 its reverse (500531821), we get a palindrome (628666826).

The spelling of 128135005 in words is "one hundred twenty-eight million, one hundred thirty-five thousand, five".