13491381 has 8 divisors (see below), whose sum is σ = 18033120. Its totient is φ = 8971952.

The previous prime is 13491377. The next prime is 13491389. The reversal of 13491381 is 18319431.

13491381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13491381 - 2² = 13491377 is a prime.

It is a super-2 number, since 2×13491381² = 364034722574322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13491389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4110 + ... + 6623.

It is an arithmetic number, because the mean of its divisors is an integer number (2254140).

Almost surely, 2^13491381 is an apocalyptic number.

It is an amenable number.

13491381 is a deficient number, since it is larger than the sum of its proper divisors (4541739).

13491381 is a wasteful number, since it uses less digits than its factorization.

13491381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11155.

The product of its digits is 2592, while the sum is 30.

The square root of 13491381 is about 3673.0615295690. The cubic root of 13491381 is about 238.0594736382.

The spelling of 13491381 in words is "thirteen million, four hundred ninety-one thousand, three hundred eighty-one".