128231 has 8 divisors (see below), whose sum is σ = 143280. Its totient is φ = 114048.

The previous prime is 128221. The next prime is 128237. The reversal of 128231 is 132821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128231 - 2¹⁰ = 127207 is a prime.

It is a super-2 number, since 2×128231² = 32886378722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125 + ... + 521.

It is an arithmetic number, because the mean of its divisors is an integer number (17910).

2¹²⁸²³¹ is an apocalyptic number.

128231 is a deficient number, since it is larger than the sum of its proper divisors (15049).

128231 is a wasteful number, since it uses less digits than its factorization.

128231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433.

The product of its digits is 96, while the sum is 17.

The square root of 128231 is about 358.0935631926. The cubic root of 128231 is about 50.4271406268.

The spelling of 128231 in words is "one hundred twenty-eight thousand, two hundred thirty-one".