5581802221 has 4 divisors (see below), whose sum is σ = 5583600700. Its totient is φ = 5580003744.

The previous prime is 5581802201. The next prime is 5581802249. The reversal of 5581802221 is 1222081855.

It is a happy number.

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 2262429225 + 3319372996 = 47565^2 + 57614^2 .

It is a cyclic number.

It is not a de Polignac number, because 5581802221 - 2⁵ = 5581802189 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 (5581802201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 894576 + ... + 900793.

It is an arithmetic number, because the mean of its divisors is an integer number (1395900175).

Almost surely, 2^5581802221 is an apocalyptic number.

It is an amenable number.

5581802221 is a deficient number, since it is larger than the sum of its proper divisors (1798479).

5581802221 is a wasteful number, since it uses less digits than its factorization.

5581802221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798478.

The product of its (nonzero) digits is 12800, while the sum is 34.

The square root of 5581802221 is about 74711.4597702387. The cubic root of 5581802221 is about 1773.8823588783.

The spelling of 5581802221 in words is "five billion, five hundred eighty-one million, eight hundred two thousand, two hundred twenty-one".