13158391 has 4 divisors (see below), whose sum is σ = 13932432. Its totient is φ = 12384352.

The previous prime is 13158389. The next prime is 13158403. The reversal of 13158391 is 19385131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19385131 = 43 ⋅450817.

It is a cyclic number.

It is not a de Polignac number, because 13158391 - 2¹ = 13158389 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13158361) 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, 386995 + ... + 387028.

It is an arithmetic number, because the mean of its divisors is an integer number (3483108).

Almost surely, 2^13158391 is an apocalyptic number.

13158391 is a deficient number, since it is larger than the sum of its proper divisors (774041).

13158391 is an equidigital number, since it uses as much as digits as its factorization.

13158391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774040.

The product of its digits is 3240, while the sum is 31.

The square root of 13158391 is about 3627.4496550607. The cubic root of 13158391 is about 236.0845658349.

It can be divided in two parts, 13 and 158391, that added together give a square (158404 = 398²).

The spelling of 13158391 in words is "thirteen million, one hundred fifty-eight thousand, three hundred ninety-one".