3101909 has 4 divisors (see below), whose sum is σ = 3105804. Its totient is φ = 3098016.

The previous prime is 3101897. The next prime is 3101947. The reversal of 3101909 is 9091013.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9091013 = 61 ⋅149033.

It can be written as a sum of positive squares in 2 ways, for example, as 286225 + 2815684 = 535^2 + 1678^2 .

It is a cyclic number.

It is not a de Polignac number, because 3101909 - 2⁸ = 3101653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3101999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272 + ... + 2505.

It is an arithmetic number, because the mean of its divisors is an integer number (776451).

Almost surely, 2^3101909 is an apocalyptic number.

It is an amenable number.

3101909 is a deficient number, since it is larger than the sum of its proper divisors (3895).

3101909 is a wasteful number, since it uses less digits than its factorization.

3101909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3894.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 3101909 is about 1761.2237223022. The cubic root of 3101909 is about 145.8398976818.

The spelling of 3101909 in words is "three million, one hundred one thousand, nine hundred nine".