561998562 has 32 divisors (see below), whose sum is σ = 1178210880. Its totient is φ = 178510080.

The previous prime is 561998557. The next prime is 561998617. The reversal of 561998562 is 265899165.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15987 + ... + 37142.

It is an arithmetic number, because the mean of its divisors is an integer number (36819090).

Almost surely, 2^561998562 is an apocalyptic number.

561998562 is an abundant number, since it is smaller than the sum of its proper divisors (616212318).

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

561998562 is a wasteful number, since it uses less digits than its factorization.

561998562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53218.

The product of its digits is 1166400, while the sum is 51.

The square root of 561998562 is about 23706.5088530555. The cubic root of 561998562 is about 825.2364486634.

The spelling of 561998562 in words is "five hundred sixty-one million, nine hundred ninety-eight thousand, five hundred sixty-two".