328949281 has 2 divisors, whose sum is σ = 328949282. Its totient is φ = 328949280.

The previous prime is 328949279. The next prime is 328949321. The reversal of 328949281 is 182949823.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 327031056 + 1918225 = 18084^2 + 1385^2 .

It is a cyclic number.

It is not a de Polignac number, because 328949281 - 2¹ = 328949279 is a prime.

It is a super-2 number, since 2×328949281² = 216415258940833922, which contains 22 as substring.

Together with 328949279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (328949081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164474640 + 164474641.

It is an arithmetic number, because the mean of its divisors is an integer number (164474641).

Almost surely, 2^328949281 is an apocalyptic number.

It is an amenable number.

328949281 is a deficient number, since it is larger than the sum of its proper divisors (1).

328949281 is an equidigital number, since it uses as much as digits as its factorization.

328949281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 46.

The square root of 328949281 is about 18136.9589788366. The cubic root of 328949281 is about 690.3081176589.

The spelling of 328949281 in words is "three hundred twenty-eight million, nine hundred forty-nine thousand, two hundred eighty-one".