128935913 has 4 divisors (see below), whose sum is σ = 133095168. Its totient is φ = 124776660.

The previous prime is 128935901. The next prime is 128935921. The reversal of 128935913 is 319539821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128935913 - 2⁴ = 128935897 is a prime.

It is a super-2 number, since 2×128935913² = 33248939322287138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128935613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2079581 + ... + 2079642.

It is an arithmetic number, because the mean of its divisors is an integer number (33273792).

Almost surely, 2^128935913 is an apocalyptic number.

It is an amenable number.

128935913 is a deficient number, since it is larger than the sum of its proper divisors (4159255).

128935913 is an equidigital number, since it uses as much as digits as its factorization.

128935913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4159254.

The product of its digits is 58320, while the sum is 41.

The square root of 128935913 is about 11354.9950682508. The cubic root of 128935913 is about 505.1937471786.

The spelling of 128935913 in words is "one hundred twenty-eight million, nine hundred thirty-five thousand, nine hundred thirteen".