3281821 has 2 divisors, whose sum is σ = 3281822. Its totient is φ = 3281820.

The previous prime is 3281791. The next prime is 3281827. The reversal of 3281821 is 1281823.

3281821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2524921 + 756900 = 1589^2 + 870^2 .

It is an emirp because it is prime and its reverse (1281823) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3281821 - 2⁷ = 3281693 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3281827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1640910 + 1640911.

It is an arithmetic number, because the mean of its divisors is an integer number (1640911).

Almost surely, 2^3281821 is an apocalyptic number.

It is an amenable number.

3281821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3281821 is an equidigital number, since it uses as much as digits as its factorization.

3281821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 25.

The square root of 3281821 is about 1811.5796973912. The cubic root of 3281821 is about 148.6066679494.

The spelling of 3281821 in words is "three million, two hundred eighty-one thousand, eight hundred twenty-one".