3109509 has 20 divisors (see below), whose sum is σ = 5004076. Its totient is φ = 1912896.

The previous prime is 3109501. The next prime is 3109511. The reversal of 3109509 is 9059013.

It can be written as a sum of positive squares in 2 ways, for example, as 1476225 + 1633284 = 1215^2 + 1278^2 .

It is not a de Polignac number, because 3109509 - 2³ = 3109501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3109501) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 424 + ... + 2529.

Almost surely, 2^3109509 is an apocalyptic number.

3109509 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

3109509 is a deficient number, since it is larger than the sum of its proper divisors (1894567).

3109509 is a wasteful number, since it uses less digits than its factorization.

3109509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2978 (or 2969 counting only the distinct ones).

The product of its (nonzero) digits is 1215, while the sum is 27.

The square root of 3109509 is about 1763.3799930815. The cubic root of 3109509 is about 145.9589081831.

The spelling of 3109509 in words is "three million, one hundred nine thousand, five hundred nine".