5639651881 has 2 divisors, whose sum is σ = 5639651882. Its totient is φ = 5639651880.

The previous prime is 5639651869. The next prime is 5639651909. The reversal of 5639651881 is 1881569365.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5355897856 + 283754025 = 73184^2 + 16845^2 .

It is a cyclic number.

It is not a de Polignac number, because 5639651881 - 2⁷ = 5639651753 is a prime.

It is a super-2 number, since 2×5639651881² = 63611346677733676322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5634651881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2819825940 + 2819825941.

It is an arithmetic number, because the mean of its divisors is an integer number (2819825941).

Almost surely, 2^5639651881 is an apocalyptic number.

It is an amenable number.

5639651881 is a deficient number, since it is larger than the sum of its proper divisors (1).

5639651881 is an equidigital number, since it uses as much as digits as its factorization.

5639651881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1555200, while the sum is 52.

The square root of 5639651881 is about 75097.6156811919. The cubic root of 5639651881 is about 1779.9894668610.

The spelling of 5639651881 in words is "five billion, six hundred thirty-nine million, six hundred fifty-one thousand, eight hundred eighty-one".