13191391 has 2 divisors, whose sum is σ = 13191392. Its totient is φ = 13191390.

The previous prime is 13191389. The next prime is 13191403. The reversal of 13191391 is 19319131.

13191391 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13191391 - 2¹ = 13191389 is a prime.

Together with 13191389, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13191331) 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, 6595695 + 6595696.

It is an arithmetic number, because the mean of its divisors is an integer number (6595696).

Almost surely, 2^13191391 is an apocalyptic number.

13191391 is a deficient number, since it is larger than the sum of its proper divisors (1).

13191391 is an equidigital number, since it uses as much as digits as its factorization.

13191391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 729, while the sum is 28.

The square root of 13191391 is about 3631.9954570456. The cubic root of 13191391 is about 236.2817603317.

The spelling of 13191391 in words is "thirteen million, one hundred ninety-one thousand, three hundred ninety-one".