3209281 has 2 divisors, whose sum is σ = 3209282. Its totient is φ = 3209280.

The previous prime is 3209279. The next prime is 3209293. The reversal of 3209281 is 1829023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3207681 + 1600 = 1791^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 3209281 - 2¹ = 3209279 is a prime.

It is a super-2 number, since 2×3209281² = 20598969073922, which contains 22 as substring.

Together with 3209279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3209201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1604640 + 1604641.

It is an arithmetic number, because the mean of its divisors is an integer number (1604641).

Almost surely, 2^3209281 is an apocalyptic number.

It is an amenable number.

3209281 is a deficient number, since it is larger than the sum of its proper divisors (1).

3209281 is an equidigital number, since it uses as much as digits as its factorization.

3209281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 3209281 is about 1791.4466221465. The cubic root of 3209281 is about 147.5035870046.

The spelling of 3209281 in words is "three million, two hundred nine thousand, two hundred eighty-one".