5681387871 has 28 divisors (see below), whose sum is σ = 8699475552. Its totient is φ = 3706982496.

The previous prime is 5681387827. The next prime is 5681387903. The reversal of 5681387871 is 1787831865.

It is a happy number.

5681387871 is a `hidden beast` number, since 568 + 1 + 3 + 8 + 7 + 8 + 71 = 666.

5681387871 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 5681387871 - 2¹¹ = 5681385823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5681387801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 48646 + ... + 117171.

Almost surely, 2^5681387871 is an apocalyptic number.

5681387871 is a deficient number, since it is larger than the sum of its proper divisors (3018087681).

5681387871 is an equidigital number, since it uses as much as digits as its factorization.

5681387871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165882 (or 165867 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 54.

The square root of 5681387871 is about 75374.9817313411. The cubic root of 5681387871 is about 1784.3695902503.

The spelling of 5681387871 in words is "five billion, six hundred eighty-one million, three hundred eighty-seven thousand, eight hundred seventy-one".