13081391 has 4 divisors (see below), whose sum is σ = 13147992. Its totient is φ = 13014792.

The previous prime is 13081379. The next prime is 13081423. The reversal of 13081391 is 19318031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19318031 = 29 ⋅666139.

It is a cyclic number.

It is not a de Polignac number, because 13081391 - 2¹⁰ = 13080367 is a prime.

It is a super-2 number, since 2×13081391² = 342245580989762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13081391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13081351) 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, 33005 + ... + 33398.

It is an arithmetic number, because the mean of its divisors is an integer number (3286998).

Almost surely, 2^13081391 is an apocalyptic number.

13081391 is a deficient number, since it is larger than the sum of its proper divisors (66601).

13081391 is an equidigital number, since it uses as much as digits as its factorization.

13081391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66600.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 13081391 is about 3616.8205650820. The cubic root of 13081391 is about 235.6231597208.

The spelling of 13081391 in words is "thirteen million, eighty-one thousand, three hundred ninety-one".