13161181 has 4 divisors (see below), whose sum is σ = 14357664. Its totient is φ = 11964700.

The previous prime is 13161173. The next prime is 13161191. The reversal of 13161181 is 18116131.

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: 18116131 = 11 ⋅1646921.

It is not a de Polignac number, because 13161181 - 2³ = 13161173 is a prime.

It is a super-2 number, since 2×13161181² = 346433370629522, 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 (13161121) 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, 598225 + ... + 598246.

It is an arithmetic number, because the mean of its divisors is an integer number (3589416).

Almost surely, 2^13161181 is an apocalyptic number.

13161181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13161181 is a deficient number, since it is larger than the sum of its proper divisors (1196483).

13161181 is a wasteful number, since it uses less digits than its factorization.

13161181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196482.

The product of its digits is 144, while the sum is 22.

The square root of 13161181 is about 3627.8342023858. The cubic root of 13161181 is about 236.1012504835.

Multiplying 13161181 by its sum of digits (22), we get a palindrome (289545982).

The spelling of 13161181 in words is "thirteen million, one hundred sixty-one thousand, one hundred eighty-one".