561651056 has 40 divisors (see below), whose sum is σ = 1130356224. Its totient is φ = 270060480.

The previous prime is 561651047. The next prime is 561651113. The reversal of 561651056 is 650156165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77375 + ... + 84321.

Almost surely, 2^561651056 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 561651056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (565178112).

561651056 is an abundant number, since it is smaller than the sum of its proper divisors (568705168).

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

561651056 is a wasteful number, since it uses less digits than its factorization.

561651056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7149 (or 7143 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 561651056 is about 23699.1783823828. The cubic root of 561651056 is about 825.0663214513.

The spelling of 561651056 in words is "five hundred sixty-one million, six hundred fifty-one thousand, fifty-six".