13158181 has 4 divisors (see below), whose sum is σ = 13227264. Its totient is φ = 13089100.

The previous prime is 13158169. The next prime is 13158193. The reversal of 13158181 is 18185131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18185131 = 167 ⋅108893.

It is an interprime number because it is at equal distance from previous prime (13158169) and next prime (13158193).

It is a cyclic number.

It is not a de Polignac number, because 13158181 - 2⁵ = 13158149 is a prime.

It is a super-2 number, since 2×13158181² = 346275454457522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13158281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34255 + ... + 34636.

It is an arithmetic number, because the mean of its divisors is an integer number (3306816).

Almost surely, 2^13158181 is an apocalyptic number.

It is an amenable number.

13158181 is a deficient number, since it is larger than the sum of its proper divisors (69083).

13158181 is an equidigital number, since it uses as much as digits as its factorization.

13158181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69082.

The product of its digits is 960, while the sum is 28.

The square root of 13158181 is about 3627.4207089887. The cubic root of 13158181 is about 236.0833099057.

The spelling of 13158181 in words is "thirteen million, one hundred fifty-eight thousand, one hundred eighty-one".