128081 has 4 divisors (see below), whose sum is σ = 128832. Its totient is φ = 127332.

The previous prime is 128053. The next prime is 128099. The reversal of 128081 is 180821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 180821 = 73 ⋅2477.

It is a cyclic number.

It is not a de Polignac number, because 128081 - 2¹⁴ = 111697 is a prime.

It is a super-2 number, since 2×128081² = 32809485122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 128081.

It is not an unprimeable number, because it can be changed into a prime (128021) 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, 20 + ... + 506.

It is an arithmetic number, because the mean of its divisors is an integer number (32208).

2¹²⁸⁰⁸¹ is an apocalyptic number.

It is an amenable number.

128081 is a deficient number, since it is larger than the sum of its proper divisors (751).

128081 is an equidigital number, since it uses as much as digits as its factorization.

128081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 128081 is about 357.8840594382. The cubic root of 128081 is about 50.4074703381.

It can be divided in two parts, 1 and 28081, that added together give a palindrome (28082).

The spelling of 128081 in words is "one hundred twenty-eight thousand, eighty-one".