13816391 has 2 divisors, whose sum is σ = 13816392. Its totient is φ = 13816390.

The previous prime is 13816381. The next prime is 13816403. The reversal of 13816391 is 19361831.

13816391 is digitally balanced in base 2, 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 a de Polignac number, because none of the positive numbers 2^k-13816391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13816381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6908195 + 6908196.

It is an arithmetic number, because the mean of its divisors is an integer number (6908196).

Almost surely, 2^13816391 is an apocalyptic number.

13816391 is a deficient number, since it is larger than the sum of its proper divisors (1).

13816391 is an equidigital number, since it uses as much as digits as its factorization.

13816391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The square root of 13816391 is about 3717.0406239373. The cubic root of 13816391 is about 239.9559583537.

The spelling of 13816391 in words is "thirteen million, eight hundred sixteen thousand, three hundred ninety-one".