561804198 has 32 divisors (see below), whose sum is σ = 1187082240. Its totient is φ = 176761440.

The previous prime is 561804197. The next prime is 561804239. The reversal of 561804198 is 891408165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561804197) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22683 + ... + 40473.

It is an arithmetic number, because the mean of its divisors is an integer number (37096320).

Almost surely, 2^561804198 is an apocalyptic number.

561804198 is an abundant number, since it is smaller than the sum of its proper divisors (625278042).

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

561804198 is a wasteful number, since it uses less digits than its factorization.

561804198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18092.

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 561804198 is about 23702.4091180622. The cubic root of 561804198 is about 825.1413032530.

It can be divided in two parts, 56180 and 4198, that added together give a triangular number (60378 = T₃₄₇).

The spelling of 561804198 in words is "five hundred sixty-one million, eight hundred four thousand, one hundred ninety-eight".