561542018 has 8 divisors (see below), whose sum is σ = 843291648. Its totient is φ = 280444804.

The previous prime is 561541997. The next prime is 561542063. The reversal of 561542018 is 810245165.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160946 + ... + 164397.

It is an arithmetic number, because the mean of its divisors is an integer number (105411456).

Almost surely, 2^561542018 is an apocalyptic number.

561542018 is a deficient number, since it is larger than the sum of its proper divisors (281749630).

561542018 is a wasteful number, since it uses less digits than its factorization.

561542018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326208.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 561542018 is about 23696.8778112223. The cubic root of 561542018 is about 825.0129256622.

The spelling of 561542018 in words is "five hundred sixty-one million, five hundred forty-two thousand, eighteen".