561522220 has 96 divisors (see below), whose sum is σ = 1405071360. Its totient is φ = 184446720.

The previous prime is 561522217. The next prime is 561522229. The reversal of 561522220 is 22225165.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (561522229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 472467 + ... + 473653.

It is an arithmetic number, because the mean of its divisors is an integer number (14636160).

Almost surely, 2^561522220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561522220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (702535680).

561522220 is an abundant number, since it is smaller than the sum of its proper divisors (843549140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561522220 is a wasteful number, since it uses less digits than its factorization.

561522220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343 (or 1341 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 561522220 is about 23696.4600731839. The cubic root of 561522220 is about 825.0032298619.

Adding to 561522220 its reverse (22225165), we get a palindrome (583747385).

The spelling of 561522220 in words is "five hundred sixty-one million, five hundred twenty-two thousand, two hundred twenty".