13661181 has 12 divisors (see below), whose sum is σ = 20011680. Its totient is φ = 8978760.

The previous prime is 13661083. The next prime is 13661191. The reversal of 13661181 is 18116631.

13661181 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13661181 - 2¹¹ = 13659133 is a prime.

It is a super-2 number, since 2×13661181² = 373255732629522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13661191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10051 + ... + 11328.

It is an arithmetic number, because the mean of its divisors is an integer number (1667640).

Almost surely, 2^13661181 is an apocalyptic number.

It is an amenable number.

13661181 is a deficient number, since it is larger than the sum of its proper divisors (6350499).

13661181 is a wasteful number, since it uses less digits than its factorization.

13661181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21456 (or 21453 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 13661181 is about 3696.1034888109. The cubic root of 13661181 is about 239.0540367887.

The spelling of 13661181 in words is "thirteen million, six hundred sixty-one thousand, one hundred eighty-one".