3281605 has 4 divisors (see below), whose sum is σ = 3937932. Its totient is φ = 2625280.

The previous prime is 3281573. The next prime is 3281627. The reversal of 3281605 is 5061823.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1726596 + 1555009 = 1314^2 + 1247^2 .

It is not a de Polignac number, because 3281605 - 2⁵ = 3281573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3281605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328156 + ... + 328165.

It is an arithmetic number, because the mean of its divisors is an integer number (984483).

Almost surely, 2^3281605 is an apocalyptic number.

It is an amenable number.

3281605 is a deficient number, since it is larger than the sum of its proper divisors (656327).

3281605 is an equidigital number, since it uses as much as digits as its factorization.

3281605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656326.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 3281605 is about 1811.5200799329. The cubic root of 3281605 is about 148.6034075904.

The spelling of 3281605 in words is "three million, two hundred eighty-one thousand, six hundred five".