13813391 has 4 divisors (see below), whose sum is σ = 13839192. Its totient is φ = 13787592.

The previous prime is 13813369. The next prime is 13813411. The reversal of 13813391 is 19331831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13813391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13813991) 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, 12080 + ... + 13173.

It is an arithmetic number, because the mean of its divisors is an integer number (3459798).

Almost surely, 2^13813391 is an apocalyptic number.

13813391 is a deficient number, since it is larger than the sum of its proper divisors (25801).

13813391 is an equidigital number, since it uses as much as digits as its factorization.

13813391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25800.

The product of its digits is 1944, while the sum is 29.

The square root of 13813391 is about 3716.6370551885. The cubic root of 13813391 is about 239.9385896119.

The spelling of 13813391 in words is "thirteen million, eight hundred thirteen thousand, three hundred ninety-one".