13318391 has 4 divisors (see below), whose sum is σ = 13455792. Its totient is φ = 13180992.

The previous prime is 13318387. The next prime is 13318421. The reversal of 13318391 is 19381331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19381331 = 2687 ⋅7213.

It is a cyclic number.

It is not a de Polignac number, because 13318391 - 2² = 13318387 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 (13318301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68555 + ... + 68748.

It is an arithmetic number, because the mean of its divisors is an integer number (3363948).

Almost surely, 2^13318391 is an apocalyptic number.

13318391 is a deficient number, since it is larger than the sum of its proper divisors (137401).

13318391 is an equidigital number, since it uses as much as digits as its factorization.

13318391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137400.

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

The square root of 13318391 is about 3649.4370798796. The cubic root of 13318391 is about 237.0376067131.

The spelling of 13318391 in words is "thirteen million, three hundred eighteen thousand, three hundred ninety-one".