328381 has 2 divisors, whose sum is σ = 328382. Its totient is φ = 328380.

The previous prime is 328379. The next prime is 328397. The reversal of 328381 is 183823.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 324900 + 3481 = 570^2 + 59^2 .

It is an emirp because it is prime and its reverse (183823) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 328381 - 2¹ = 328379 is a prime.

It is a super-2 number, since 2×328381² = 215668162322, which contains 22 as substring.

Together with 328379, it forms a pair of twin primes.

It is a nialpdrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164190 + 164191.

It is an arithmetic number, because the mean of its divisors is an integer number (164191).

2³²⁸³⁸¹ is an apocalyptic number.

It is an amenable number.

328381 is a deficient number, since it is larger than the sum of its proper divisors (1).

328381 is an equidigital number, since it uses as much as digits as its factorization.

328381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

The square root of 328381 is about 573.0453734217. The cubic root of 328381 is about 68.9910371331.

It can be divided in two parts, 3283 and 81, that added together give a square (3364 = 58²).

The spelling of 328381 in words is "three hundred twenty-eight thousand, three hundred eighty-one".