109391 has 2 divisors, whose sum is σ = 109392. Its totient is φ = 109390.

The previous prime is 109387. The next prime is 109397. The reversal of 109391 is 193901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 109391 - 2² = 109387 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54695 + 54696.

It is an arithmetic number, because the mean of its divisors is an integer number (54696).

2¹⁰⁹³⁹¹ is an apocalyptic number.

109391 is a deficient number, since it is larger than the sum of its proper divisors (1).

109391 is an equidigital number, since it uses as much as digits as its factorization.

109391 is an odious number, because the sum of its binary digits is odd.

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

The square root of 109391 is about 330.7431027248. The cubic root of 109391 is about 47.8256114098.

The spelling of 109391 in words is "one hundred nine thousand, three hundred ninety-one".