128131709439 has 16 divisors (see below), whose sum is σ = 180222425600. Its totient is φ = 80750488896.

The previous prime is 128131709423. The next prime is 128131709501. The reversal of 128131709439 is 934907131821.

It is not a de Polignac number, because 128131709439 - 2⁴ = 128131709423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128131709639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2401174 + ... + 2453955.

It is an arithmetic number, because the mean of its divisors is an integer number (11263901600).

Almost surely, 2^128131709439 is an apocalyptic number.

128131709439 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

128131709439 is a deficient number, since it is larger than the sum of its proper divisors (52090716161).

128131709439 is a wasteful number, since it uses less digits than its factorization.

128131709439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4855614.

The product of its (nonzero) digits is 326592, while the sum is 48.

The spelling of 128131709439 in words is "one hundred twenty-eight billion, one hundred thirty-one million, seven hundred nine thousand, four hundred thirty-nine".