3281809 has 4 divisors (see below), whose sum is σ = 3285504. Its totient is φ = 3278116.

The previous prime is 3281791. The next prime is 3281821. The reversal of 3281809 is 9081823.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9081823 = 71 ⋅127913.

It is a cyclic number.

It is not a de Polignac number, because 3281809 - 2⁵ = 3281777 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3281849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384 + ... + 2590.

It is an arithmetic number, because the mean of its divisors is an integer number (821376).

Almost surely, 2^3281809 is an apocalyptic number.

It is an amenable number.

3281809 is a deficient number, since it is larger than the sum of its proper divisors (3695).

3281809 is a wasteful number, since it uses less digits than its factorization.

3281809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3694.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 3281809 is about 1811.5763853617. The cubic root of 3281809 is about 148.6064868221.

The spelling of 3281809 in words is "three million, two hundred eighty-one thousand, eight hundred nine".