328191 has 4 divisors (see below), whose sum is σ = 437592. Its totient is φ = 218792.

The previous prime is 328177. The next prime is 328213. The reversal of 328191 is 191823.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 328191 - 2⁶ = 328127 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328121) 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, 54696 + ... + 54701.

It is an arithmetic number, because the mean of its divisors is an integer number (109398).

2³²⁸¹⁹¹ is an apocalyptic number.

328191 is a deficient number, since it is larger than the sum of its proper divisors (109401).

328191 is a wasteful number, since it uses less digits than its factorization.

328191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109400.

The product of its digits is 432, while the sum is 24.

The square root of 328191 is about 572.8795684959. The cubic root of 328191 is about 68.9777285819.

The spelling of 328191 in words is "three hundred twenty-eight thousand, one hundred ninety-one".