3281781 has 4 divisors (see below), whose sum is σ = 4375712. Its totient is φ = 2187852.

The previous prime is 3281777. The next prime is 3281783. The reversal of 3281781 is 1871823.

It is a happy number.

3281781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is not a de Polignac number, because 3281781 - 2² = 3281777 is a prime.

It is a super-2 number, since 2×3281781² = 21540173063922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3281783) 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 in 3 ways as a sum of consecutive naturals, for example, 546961 + ... + 546966.

It is an arithmetic number, because the mean of its divisors is an integer number (1093928).

Almost surely, 2^3281781 is an apocalyptic number.

It is an amenable number.

3281781 is a deficient number, since it is larger than the sum of its proper divisors (1093931).

3281781 is a wasteful number, since it uses less digits than its factorization.

3281781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093930.

The product of its digits is 2688, while the sum is 30.

The square root of 3281781 is about 1811.5686572692. The cubic root of 3281781 is about 148.6060641900.

The spelling of 3281781 in words is "three million, two hundred eighty-one thousand, seven hundred eighty-one".