561100 has 36 divisors (see below), whose sum is σ = 1263808. Its totient is φ = 216000.

The previous prime is 561097. The next prime is 561101. The reversal of 561100 is 1165.

561100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (561101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3010 + ... + 3190.

2⁵⁶¹¹⁰⁰ is an apocalyptic number.

561100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (631904).

561100 is an abundant number, since it is smaller than the sum of its proper divisors (702708).

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

561100 is a wasteful number, since it uses less digits than its factorization.

561100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 561100 is about 749.0660852021. The cubic root of 561100 is about 82.4796399100.

Adding to 561100 its reverse (1165), we get a palindrome (562265).

It can be divided in two parts, 56 and 1100, that added together give a square (1156 = 34²).

The spelling of 561100 in words is "five hundred sixty-one thousand, one hundred".