5639056861 has 4 divisors (see below), whose sum is σ = 5648967900. Its totient is φ = 5629145824.

The previous prime is 5639056849. The next prime is 5639056867. The reversal of 5639056861 is 1686509365.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1686509365 = 5 ⋅337301873.

It can be written as a sum of positive squares in 2 ways, for example, as 3389451961 + 2249604900 = 58219^2 + 47430^2 .

It is a cyclic number.

It is not a de Polignac number, because 5639056861 - 2²⁷ = 5504839133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5639056867) 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 3 ways as a sum of consecutive naturals, for example, 4954666 + ... + 4955803.

It is an arithmetic number, because the mean of its divisors is an integer number (1412241975).

Almost surely, 2^5639056861 is an apocalyptic number.

It is an amenable number.

5639056861 is a deficient number, since it is larger than the sum of its proper divisors (9911039).

5639056861 is an equidigital number, since it uses as much as digits as its factorization.

5639056861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9911038.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The square root of 5639056861 is about 75093.6539329390. The cubic root of 5639056861 is about 1779.9268644992.

The spelling of 5639056861 in words is "five billion, six hundred thirty-nine million, fifty-six thousand, eight hundred sixty-one".