220530561 has 4 divisors (see below), whose sum is σ = 294040752. Its totient is φ = 147020372.

The previous prime is 220530553. The next prime is 220530599. The reversal of 220530561 is 165035022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220530561 - 2³ = 220530553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220531561) 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 in 3 ways as a sum of consecutive naturals, for example, 36755091 + ... + 36755096.

It is an arithmetic number, because the mean of its divisors is an integer number (73510188).

Almost surely, 2^220530561 is an apocalyptic number.

It is an amenable number.

220530561 is a deficient number, since it is larger than the sum of its proper divisors (73510191).

220530561 is an equidigital number, since it uses as much as digits as its factorization.

220530561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73510190.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 220530561 is about 14850.2714116611. The cubic root of 220530561 is about 604.1659714131.

Adding to 220530561 its reverse (165035022), we get a palindrome (385565583).

The spelling of 220530561 in words is "two hundred twenty million, five hundred thirty thousand, five hundred sixty-one".