13321391 has 4 divisors (see below), whose sum is σ = 13572792. Its totient is φ = 13069992.

The previous prime is 13321379. The next prime is 13321397. The reversal of 13321391 is 19312331.

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

It is a cyclic number.

It is not a de Polignac number, because 13321391 - 2⁶ = 13321327 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 (13321397) 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, 125621 + ... + 125726.

It is an arithmetic number, because the mean of its divisors is an integer number (3393198).

Almost surely, 2^13321391 is an apocalyptic number.

13321391 is a deficient number, since it is larger than the sum of its proper divisors (251401).

13321391 is an equidigital number, since it uses as much as digits as its factorization.

13321391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251400.

The product of its digits is 486, while the sum is 23.

The square root of 13321391 is about 3649.8480790301. The cubic root of 13321391 is about 237.0554031430.

The spelling of 13321391 in words is "thirteen million, three hundred twenty-one thousand, three hundred ninety-one".