128331 has 24 divisors (see below), whose sum is σ = 223440. Its totient is φ = 72576.

The previous prime is 128327. The next prime is 128339. The reversal of 128331 is 133821.

It is not a de Polignac number, because 128331 - 2² = 128327 is a prime.

It is a super-2 number, since 2×128331² = 32937691122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1275 + ... + 1371.

It is an arithmetic number, because the mean of its divisors is an integer number (9310).

2¹²⁸³³¹ is an apocalyptic number.

128331 is a deficient number, since it is larger than the sum of its proper divisors (95109).

128331 is an equidigital number, since it uses as much as digits as its factorization.

128331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120 (or 107 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 128331 is about 358.2331642939. The cubic root of 128331 is about 50.4402456321.

The spelling of 128331 in words is "one hundred twenty-eight thousand, three hundred thirty-one".