5541220561 has 4 divisors (see below), whose sum is σ = 5676372324. Its totient is φ = 5406068800.

The previous prime is 5541220549. The next prime is 5541220571. The reversal of 5541220561 is 1650221455.

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 3106390225 + 2434830336 = 55735^2 + 49344^2 .

It is a cyclic number.

It is not a de Polignac number, because 5541220561 - 2¹¹ = 5541218513 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5541220511) 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, 67575820 + ... + 67575901.

It is an arithmetic number, because the mean of its divisors is an integer number (1419093081).

Almost surely, 2^5541220561 is an apocalyptic number.

It is an amenable number.

5541220561 is a deficient number, since it is larger than the sum of its proper divisors (135151763).

5541220561 is a wasteful number, since it uses less digits than its factorization.

5541220561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135151762.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 5541220561 is about 74439.3750712618. The cubic root of 5541220561 is about 1769.5729827351.

The spelling of 5541220561 in words is "five billion, five hundred forty-one million, two hundred twenty thousand, five hundred sixty-one".