5631844385 has 4 divisors (see below), whose sum is σ = 6758213268. Its totient is φ = 4505475504.

The previous prime is 5631844343. The next prime is 5631844447. The reversal of 5631844385 is 5834481365.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4110220321 + 1521624064 = 64111^2 + 39008^2 .

It is a cyclic number.

It is not a de Polignac number, because 5631844385 - 2⁸ = 5631844129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 563184434 + ... + 563184443.

It is an arithmetic number, because the mean of its divisors is an integer number (1689553317).

Almost surely, 2^5631844385 is an apocalyptic number.

It is an amenable number.

5631844385 is a deficient number, since it is larger than the sum of its proper divisors (1126368883).

5631844385 is a wasteful number, since it uses less digits than its factorization.

5631844385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126368882.

The product of its digits is 1382400, while the sum is 47.

The square root of 5631844385 is about 75045.6153615919. The cubic root of 5631844385 is about 1779.1676857202.

The spelling of 5631844385 in words is "five billion, six hundred thirty-one million, eight hundred forty-four thousand, three hundred eighty-five".