3109391 has 2 divisors, whose sum is σ = 3109392. Its totient is φ = 3109390.

The previous prime is 3109387. The next prime is 3109397. The reversal of 3109391 is 1939013.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3109391 - 2² = 3109387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3109391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3109397) 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 as a sum of consecutive naturals, namely, 1554695 + 1554696.

It is an arithmetic number, because the mean of its divisors is an integer number (1554696).

Almost surely, 2^3109391 is an apocalyptic number.

3109391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3109391 is an equidigital number, since it uses as much as digits as its factorization.

3109391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 26.

The square root of 3109391 is about 1763.3465342921. The cubic root of 3109391 is about 145.9570618713.

The spelling of 3109391 in words is "three million, one hundred nine thousand, three hundred ninety-one".