3306561 has 4 divisors (see below), whose sum is σ = 4408752. Its totient is φ = 2204372.

The previous prime is 3306559. The next prime is 3306587. The reversal of 3306561 is 1656033.

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 an emirpimes, since its reverse is a distinct semiprime: 1656033 = 3 ⋅552011.

It is a cyclic number.

It is not a de Polignac number, because 3306561 - 2¹ = 3306559 is a prime.

It is an Ulam number.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (3306521) 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, 551091 + ... + 551096.

It is an arithmetic number, because the mean of its divisors is an integer number (1102188).

Almost surely, 2^3306561 is an apocalyptic number.

It is an amenable number.

3306561 is a deficient number, since it is larger than the sum of its proper divisors (1102191).

3306561 is a wasteful number, since it uses less digits than its factorization.

3306561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102190.

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 3306561 is about 1818.3951715730. The cubic root of 3306561 is about 148.9791571824.

The spelling of 3306561 in words is "three million, three hundred six thousand, five hundred sixty-one".