328093681 has 2 divisors, whose sum is σ = 328093682. Its totient is φ = 328093680.

The previous prime is 328093669. The next prime is 328093687. The reversal of 328093681 is 186390823.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175324081 + 152769600 = 13241^2 + 12360^2 .

It is an emirp because it is prime and its reverse (186390823) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 328093681 - 2⁹ = 328093169 is a prime.

It is a super-2 number, since 2×328093681² = 215290927024259522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (328093687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164046840 + 164046841.

It is an arithmetic number, because the mean of its divisors is an integer number (164046841).

Almost surely, 2^328093681 is an apocalyptic number.

It is an amenable number.

328093681 is a deficient number, since it is larger than the sum of its proper divisors (1).

328093681 is an equidigital number, since it uses as much as digits as its factorization.

328093681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 328093681 is about 18113.3564255772. The cubic root of 328093681 is about 689.7090988266.

The spelling of 328093681 in words is "three hundred twenty-eight million, ninety-three thousand, six hundred eighty-one".