128359831 has 4 divisors (see below), whose sum is σ = 129032064. Its totient is φ = 127687600.

The previous prime is 128359823. The next prime is 128359837. The reversal of 128359831 is 138953821.

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

It is a cyclic number.

It is not a de Polignac number, because 128359831 - 2³ = 128359823 is a prime.

It is a super-2 number, since 2×128359831² = 32952492428697122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128359837) 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 in 3 ways as a sum of consecutive naturals, for example, 335830 + ... + 336211.

It is an arithmetic number, because the mean of its divisors is an integer number (32258016).

Almost surely, 2^128359831 is an apocalyptic number.

128359831 is a deficient number, since it is larger than the sum of its proper divisors (672233).

128359831 is an equidigital number, since it uses as much as digits as its factorization.

128359831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672232.

The product of its digits is 51840, while the sum is 40.

The square root of 128359831 is about 11329.5997722779. The cubic root of 128359831 is about 504.4402267177.

The spelling of 128359831 in words is "one hundred twenty-eight million, three hundred fifty-nine thousand, eight hundred thirty-one".