561656 has 8 divisors (see below), whose sum is σ = 1053120. Its totient is φ = 280824.

The previous prime is 561607. The next prime is 561667. The reversal of 561656 is 656165.

It is a tau number, because it is divible by the number of its divisors (8).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35096 + ... + 35111.

It is an arithmetic number, because the mean of its divisors is an integer number (131640).

2⁵⁶¹⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

561656 is a deficient number, since it is larger than the sum of its proper divisors (491464).

561656 is a wasteful number, since it uses less digits than its factorization.

561656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70213 (or 70209 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

The square root of 561656 is about 749.4371221123. The cubic root of 561656 is about 82.5068742359.

The spelling of 561656 in words is "five hundred sixty-one thousand, six hundred fifty-six".