561018 has 8 divisors (see below), whose sum is σ = 1122048. Its totient is φ = 187004.

The previous prime is 560977. The next prime is 561019. The reversal of 561018 is 810165.

It is a sphenic number, since it is the product of 3 distinct primes.

561018 is an admirable number.

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

It is a junction number, because it is equal to n+sod(n) for n = 560985 and 561003.

It is not an unprimeable number, because it can be changed into a prime (561019) by changing a digit.

561018 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46746 + ... + 46757.

It is an arithmetic number, because the mean of its divisors is an integer number (140256).

2⁵⁶¹⁰¹⁸ is an apocalyptic number.

561018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

561018 is a wasteful number, since it uses less digits than its factorization.

561018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93508.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 561018 is about 749.0113483786. The cubic root of 561018 is about 82.4756218146.

The spelling of 561018 in words is "five hundred sixty-one thousand, eighteen".