13888519681 has 4 divisors (see below), whose sum is σ = 13888757764. Its totient is φ = 13888281600.

The previous prime is 13888519669. The next prime is 13888519741. The reversal of 13888519681 is 18691588831.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18691588831 = 1097 ⋅17038823.

It can be written as a sum of positive squares in 2 ways, for example, as 10448110656 + 3440409025 = 102216^2 + 58655^2 .

It is a cyclic number.

It is not a de Polignac number, because 13888519681 - 2¹¹ = 13888517633 is a prime.

It is a super-2 number, since 2×13888519681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13888519181) 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, 34321 + ... + 170161.

It is an arithmetic number, because the mean of its divisors is an integer number (3472189441).

Almost surely, 2^13888519681 is an apocalyptic number.

It is an amenable number.

13888519681 is a deficient number, since it is larger than the sum of its proper divisors (238083).

13888519681 is a wasteful number, since it uses less digits than its factorization.

13888519681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238082.

The product of its digits is 3317760, while the sum is 58.

The spelling of 13888519681 in words is "thirteen billion, eight hundred eighty-eight million, five hundred nineteen thousand, six hundred eighty-one".