561616 has 20 divisors (see below), whose sum is σ = 1187424. Its totient is φ = 255200.

The previous prime is 561607. The next prime is 561667. The reversal of 561616 is 616165.

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

It is a congruent number.

It is an unprimeable number.

561616 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 1420 + ... + 1771.

2⁵⁶¹⁶¹⁶ is an apocalyptic number.

It is an amenable number.

561616 is an abundant number, since it is smaller than the sum of its proper divisors (625808).

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

561616 is a wasteful number, since it uses less digits than its factorization.

561616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210 (or 3204 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

The square root of 561616 is about 749.4104349420. The cubic root of 561616 is about 82.5049155320.

The spelling of 561616 in words is "five hundred sixty-one thousand, six hundred sixteen".