13541981 has 2 divisors, whose sum is σ = 13541982. Its totient is φ = 13541980.

The previous prime is 13541971. The next prime is 13541993. The reversal of 13541981 is 18914531.

13541981 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., 9302500 + 4239481 = 3050^2 + 2059^2 .

It is an emirp because it is prime and its reverse (18914531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13541981 - 2¹⁸ = 13279837 is a prime.

It is a super-2 number, since 2×13541981² = 366770498808722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13541951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6770990 + 6770991.

It is an arithmetic number, because the mean of its divisors is an integer number (6770991).

Almost surely, 2^13541981 is an apocalyptic number.

It is an amenable number.

13541981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13541981 is an equidigital number, since it uses as much as digits as its factorization.

13541981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 32.

The square root of 13541981 is about 3679.9430702118. The cubic root of 13541981 is about 238.3567197399.

The spelling of 13541981 in words is "thirteen million, five hundred forty-one thousand, nine hundred eighty-one".