13581181 has 12 divisors (see below), whose sum is σ = 15183612. Its totient is φ = 12104064.

The previous prime is 13581173. The next prime is 13581199. The reversal of 13581181 is 18118531.

It can be written as a sum of positive squares in 2 ways, for example, as 12489156 + 1092025 = 3534^2 + 1045^2 .

It is not a de Polignac number, because 13581181 - 2³ = 13581173 is a prime.

It is a super-2 number, since 2×13581181² = 368896954709522, 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 (13581121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5031 + ... + 7243.

It is an arithmetic number, because the mean of its divisors is an integer number (1265301).

Almost surely, 2^13581181 is an apocalyptic number.

It is an amenable number.

13581181 is a deficient number, since it is larger than the sum of its proper divisors (1602431).

13581181 is a wasteful number, since it uses less digits than its factorization.

13581181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268 (or 2249 counting only the distinct ones).

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

The square root of 13581181 is about 3685.2653907148. The cubic root of 13581181 is about 238.5864887389.

The spelling of 13581181 in words is "thirteen million, five hundred eighty-one thousand, one hundred eighty-one".