328189481 has 2 divisors, whose sum is σ = 328189482. Its totient is φ = 328189480.

The previous prime is 328189441. The next prime is 328189493. The reversal of 328189481 is 184981823.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 328189456 + 25 = 18116^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 328189481 - 2¹⁰ = 328188457 is a prime.

It is a super-2 number, since 2×328189481² = 215416670878098722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (328189441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164094740 + 164094741.

It is an arithmetic number, because the mean of its divisors is an integer number (164094741).

Almost surely, 2^328189481 is an apocalyptic number.

It is an amenable number.

328189481 is a deficient number, since it is larger than the sum of its proper divisors (1).

328189481 is an equidigital number, since it uses as much as digits as its factorization.

328189481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 44.

The square root of 328189481 is about 18116.0006899978. Note that the first 3 decimals coincide. The cubic root of 328189481 is about 689.7762216287.

The spelling of 328189481 in words is "three hundred twenty-eight million, one hundred eighty-nine thousand, four hundred eighty-one".