13871818549 has 4 divisors (see below), whose sum is σ = 13900303264. Its totient is φ = 13843333836.

The previous prime is 13871818537. The next prime is 13871818567. The reversal of 13871818549 is 94581817831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94581817831 = 17 ⋅5563636343.

It is a cyclic number.

It is not a de Polignac number, because 13871818549 - 2¹⁷ = 13871687477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13871818549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13871818529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14241627 + ... + 14242600.

It is an arithmetic number, because the mean of its divisors is an integer number (3475075816).

Almost surely, 2^13871818549 is an apocalyptic number.

It is an amenable number.

13871818549 is a deficient number, since it is larger than the sum of its proper divisors (28484715).

13871818549 is an equidigital number, since it uses as much as digits as its factorization.

13871818549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28484714.

The product of its digits is 1935360, while the sum is 55.

The spelling of 13871818549 in words is "thirteen billion, eight hundred seventy-one million, eight hundred eighteen thousand, five hundred forty-nine".