3309 has 4 divisors (see below), whose sum is σ = 4416. Its totient is φ = 2204.

The previous prime is 3307. The next prime is 3313. The reversal of 3309 is 9033.

3309 = 15² + 16² + ... + 23².

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: 9033 = 3 ⋅3011.

It is a cyclic number.

It is not a de Polignac number, because 3309 - 2¹ = 3307 is a prime.

It is a D-number.

It is a Curzon number.

It is a plaindrome in base 13.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3301) 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, 549 + ... + 554.

It is an arithmetic number, because the mean of its divisors is an integer number (1104).

2³³⁰⁹ is an apocalyptic number.

It is an amenable number.

3309 is a deficient number, since it is larger than the sum of its proper divisors (1107).

3309 is a wasteful number, since it uses less digits than its factorization.

3309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106.

The product of its (nonzero) digits is 81, while the sum is 15.

The square root of 3309 is about 57.5239080731. The cubic root of 3309 is about 14.9015778399.

The spelling of 3309 in words is "three thousand, three hundred nine".