3109309 has 4 divisors (see below), whose sum is σ = 3553504. Its totient is φ = 2665116.

The previous prime is 3109307. The next prime is 3109319. The reversal of 3109309 is 9039013.

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: 9039013 = 1249 ⋅7237.

It is a cyclic number.

It is not a de Polignac number, because 3109309 - 2¹ = 3109307 is a prime.

It is an Ulam 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 (3109307) 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, 222087 + ... + 222100.

It is an arithmetic number, because the mean of its divisors is an integer number (888376).

Almost surely, 2^3109309 is an apocalyptic number.

It is an amenable number.

3109309 is a deficient number, since it is larger than the sum of its proper divisors (444195).

3109309 is an equidigital number, since it uses as much as digits as its factorization.

3109309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444194.

The product of its (nonzero) digits is 729, while the sum is 25.

The square root of 3109309 is about 1763.3232828951. The cubic root of 3109309 is about 145.9557788136.

The spelling of 3109309 in words is "three million, one hundred nine thousand, three hundred nine".