13818481 has 2 divisors, whose sum is σ = 13818482. Its totient is φ = 13818480.

The previous prime is 13818479. The next prime is 13818487. The reversal of 13818481 is 18481831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11971600 + 1846881 = 3460^2 + 1359^2 .

It is an emirp because it is prime and its reverse (18481831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13818481 - 2¹ = 13818479 is a prime.

It is a super-2 number, since 2×13818481² = 381900834294722, which contains 22 as substring.

Together with 13818479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13818487) 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, 6909240 + 6909241.

It is an arithmetic number, because the mean of its divisors is an integer number (6909241).

Almost surely, 2^13818481 is an apocalyptic number.

It is an amenable number.

13818481 is a deficient number, since it is larger than the sum of its proper divisors (1).

13818481 is an equidigital number, since it uses as much as digits as its factorization.

13818481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 34.

The square root of 13818481 is about 3717.3217509384. The cubic root of 13818481 is about 239.9680570913.

The spelling of 13818481 in words is "thirteen million, eight hundred eighteen thousand, four hundred eighty-one".