13985181 has 12 divisors (see below), whose sum is σ = 23086752. Its totient is φ = 7991496.

The previous prime is 13985177. The next prime is 13985189. The reversal of 13985181 is 18158931.

13985181 is a `hidden beast` number, since 139 + 8 + 518 + 1 = 666.

It is not a de Polignac number, because 13985181 - 2² = 13985177 is a prime.

It is a super-2 number, since 2×13985181² = 391170575205522, 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 (13985189) 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, 110931 + ... + 111056.

It is an arithmetic number, because the mean of its divisors is an integer number (1923896).

Almost surely, 2^13985181 is an apocalyptic number.

It is an amenable number.

13985181 is a deficient number, since it is larger than the sum of its proper divisors (9101571).

13985181 is a wasteful number, since it uses less digits than its factorization.

13985181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222000 (or 221997 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 13985181 is about 3739.6765902949. The cubic root of 13985181 is about 240.9291585428.

The spelling of 13985181 in words is "thirteen million, nine hundred eighty-five thousand, one hundred eighty-one".