561612 has 24 divisors (see below), whose sum is σ = 1388016. Its totient is φ = 176128.

The previous prime is 561607. The next prime is 561667. The reversal of 561612 is 216165.

It is a happy number.

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

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, 1173 + ... + 1580.

It is an arithmetic number, because the mean of its divisors is an integer number (57834).

2⁵⁶¹⁶¹² is an apocalyptic number.

It is an amenable number.

561612 is an abundant number, since it is smaller than the sum of its proper divisors (826404).

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

561612 is a wasteful number, since it uses less digits than its factorization.

561612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777 (or 2775 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 561612 is about 749.4077661727. The cubic root of 561612 is about 82.5047196565.

Adding to 561612 its reverse (216165), we get a palindrome (777777).

The spelling of 561612 in words is "five hundred sixty-one thousand, six hundred twelve".