128439338113 has 4 divisors (see below), whose sum is σ = 128440122628. Its totient is φ = 128438553600.

The previous prime is 128439338107. The next prime is 128439338119. The reversal of 128439338113 is 311833934821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (128439338107) and next prime (128439338119).

It can be written as a sum of positive squares in 2 ways, for example, as 57891728449 + 70547609664 = 240607^2 + 265608^2 .

It is a cyclic number.

It is not a de Polignac number, because 128439338113 - 2²⁹ = 127902467201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128439338119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43056 + ... + 508657.

It is an arithmetic number, because the mean of its divisors is an integer number (32110030657).

Almost surely, 2^128439338113 is an apocalyptic number.

It is an amenable number.

128439338113 is a deficient number, since it is larger than the sum of its proper divisors (784515).

128439338113 is an equidigital number, since it uses as much as digits as its factorization.

128439338113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784514.

The product of its digits is 373248, while the sum is 46.

The spelling of 128439338113 in words is "one hundred twenty-eight billion, four hundred thirty-nine million, three hundred thirty-eight thousand, one hundred thirteen".