13881181 has 2 divisors, whose sum is σ = 13881182. Its totient is φ = 13881180.

The previous prime is 13881173. The next prime is 13881193. The reversal of 13881181 is 18118831.

13881181 = 2634² + 2635².

13881181 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6943225 + 6937956 = 2635^2 + 2634^2 .

It is an emirp because it is prime and its reverse (18118831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13881181 - 2³ = 13881173 is a prime.

It is a super-2 number, since 2×13881181² = 385374371909522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13881151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6940590 + 6940591.

It is an arithmetic number, because the mean of its divisors is an integer number (6940591).

Almost surely, 2^13881181 is an apocalyptic number.

13881181 is the 2635-th centered square number.

It is an amenable number.

13881181 is a deficient number, since it is larger than the sum of its proper divisors (1).

13881181 is an equidigital number, since it uses as much as digits as its factorization.

13881181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 31.

The square root of 13881181 is about 3725.7456971726. The cubic root of 13881181 is about 240.3304533584.

The spelling of 13881181 in words is "thirteen million, eight hundred eighty-one thousand, one hundred eighty-one".