561646 has 8 divisors (see below), whose sum is σ = 892080. Its totient is φ = 264288.

The previous prime is 561607. The next prime is 561667. The reversal of 561646 is 646165.

561646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8226 + ... + 8293.

It is an arithmetic number, because the mean of its divisors is an integer number (111510).

2⁵⁶¹⁶⁴⁶ is an apocalyptic number.

561646 is a deficient number, since it is larger than the sum of its proper divisors (330434).

561646 is a wasteful number, since it uses less digits than its factorization.

561646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16538.

The product of its digits is 4320, while the sum is 28.

The square root of 561646 is about 749.4304504088. The cubic root of 561646 is about 82.5063845686.

The spelling of 561646 in words is "five hundred sixty-one thousand, six hundred forty-six".