561560 has 32 divisors (see below), whose sum is σ = 1285200. Its totient is φ = 220800.

The previous prime is 561559. The next prime is 561599. The reversal of 561560 is 65165.

561560 is nontrivially palindromic in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3971 + ... + 4109.

2⁵⁶¹⁵⁶⁰ is an apocalyptic number.

It is an amenable number.

561560 is an abundant number, since it is smaller than the sum of its proper divisors (723640).

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

561560 is a wasteful number, since it uses less digits than its factorization.

561560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 561560 is about 749.3730713069. The cubic root of 561560 is about 82.5021731904.

The spelling of 561560 in words is "five hundred sixty-one thousand, five hundred sixty".