561198 has 24 divisors (see below), whose sum is σ = 1235304. Its totient is φ = 169840.

The previous prime is 561191. The next prime is 561199. The reversal of 561198 is 891165.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561191) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 340 + ... + 1112.

It is an arithmetic number, because the mean of its divisors is an integer number (51471).

2⁵⁶¹¹⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (617652).

561198 is an abundant number, since it is smaller than the sum of its proper divisors (674106).

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

561198 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 13 representation: 561198 = (168591)₁₃.

561198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800 (or 789 counting only the distinct ones).

The product of its digits is 2160, while the sum is 30.

The square root of 561198 is about 749.1314971352. The cubic root of 561198 is about 82.4844415105.

The spelling of 561198 in words is "five hundred sixty-one thousand, one hundred ninety-eight".