13512181 has 2 divisors, whose sum is σ = 13512182. Its totient is φ = 13512180.

The previous prime is 13512179. The next prime is 13512199. The reversal of 13512181 is 18121531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9548100 + 3964081 = 3090^2 + 1991^2 .

It is an emirp because it is prime and its reverse (18121531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13512181 - 2¹ = 13512179 is a prime.

It is a super-2 number, since 2×13512181² = 365158070753522, which contains 22 as substring.

Together with 13512179, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13512131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6756090 + 6756091.

It is an arithmetic number, because the mean of its divisors is an integer number (6756091).

Almost surely, 2^13512181 is an apocalyptic number.

It is an amenable number.

13512181 is a deficient number, since it is larger than the sum of its proper divisors (1).

13512181 is an equidigital number, since it uses as much as digits as its factorization.

13512181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 22.

The square root of 13512181 is about 3675.8918645684. The cubic root of 13512181 is about 238.1817515711.

The spelling of 13512181 in words is "thirteen million, five hundred twelve thousand, one hundred eighty-one".