328231 has 4 divisors (see below), whose sum is σ = 329472. Its totient is φ = 326992.

The previous prime is 328213. The next prime is 328243. The reversal of 328231 is 132823.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 132823 = 317 ⋅419.

It is a cyclic number.

It is not a de Polignac number, because 328231 - 2⁷ = 328103 is a prime.

It is a super-2 number, since 2×328231² = 215471178722, which contains 22 as substring.

It is an Ulam number.

It is a d-powerful number, because it can be written as 3⁵ + 2¹⁶ + 2¹⁸ + 8² + 3⁵ + 1 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 328199 and 328208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46 + ... + 811.

It is an arithmetic number, because the mean of its divisors is an integer number (82368).

2³²⁸²³¹ is an apocalyptic number.

328231 is a deficient number, since it is larger than the sum of its proper divisors (1241).

328231 is an equidigital number, since it uses as much as digits as its factorization.

328231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240.

The product of its digits is 288, while the sum is 19.

The square root of 328231 is about 572.9144787837. The cubic root of 328231 is about 68.9805308089.

The spelling of 328231 in words is "three hundred twenty-eight thousand, two hundred thirty-one".