561156 has 24 divisors (see below), whose sum is σ = 1325184. Its totient is φ = 184800.

The previous prime is 561109. The next prime is 561161. The reversal of 561156 is 651165.

It is an unprimeable number.

561156 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 981 + ... + 1443.

It is an arithmetic number, because the mean of its divisors is an integer number (55216).

2⁵⁶¹¹⁵⁶ is an apocalyptic number.

It is an amenable number.

561156 is an abundant number, since it is smaller than the sum of its proper divisors (764028).

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

561156 is a wasteful number, since it uses less digits than its factorization.

561156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 569 counting only the distinct ones).

The product of its digits is 900, while the sum is 24.

The square root of 561156 is about 749.1034641490. The cubic root of 561156 is about 82.4823837501.

Subtracting 561156 from its reverse (651165), we obtain a palindrome (90009).

It can be divided in two parts, 561 and 156, that added together give a palindrome (717).

The spelling of 561156 in words is "five hundred sixty-one thousand, one hundred fifty-six".