128031 has 4 divisors (see below), whose sum is σ = 170712. Its totient is φ = 85352.

The previous prime is 128021. The next prime is 128033. The reversal of 128031 is 130821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130821 = 3 ⋅43607.

It is a cyclic number.

It is not a de Polignac number, because 128031 - 2¹³ = 119839 is a prime.

It is a super-2 number, since 2×128031² = 32783873922, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 128031.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 128031.

It is not an unprimeable number, because it can be changed into a prime (128033) 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 3 ways as a sum of consecutive naturals, for example, 21336 + ... + 21341.

It is an arithmetic number, because the mean of its divisors is an integer number (42678).

2¹²⁸⁰³¹ is an apocalyptic number.

128031 is a deficient number, since it is larger than the sum of its proper divisors (42681).

128031 is an equidigital number, since it uses as much as digits as its factorization.

128031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42680.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 128031 is about 357.8141975942. The cubic root of 128031 is about 50.4009101624.

Adding to 128031 its reverse (130821), we get a palindrome (258852).

The spelling of 128031 in words is "one hundred twenty-eight thousand, thirty-one".