561999912 has 16 divisors (see below), whose sum is σ = 1404999840. Its totient is φ = 187333296.

The previous prime is 561999901. The next prime is 561999913. The reversal of 561999912 is 219999165.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (561999913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11708308 + ... + 11708355.

It is an arithmetic number, because the mean of its divisors is an integer number (87812490).

Almost surely, 2^561999912 is an apocalyptic number.

It is an amenable number.

561999912 is an abundant number, since it is smaller than the sum of its proper divisors (842999928).

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

561999912 is a wasteful number, since it uses less digits than its factorization.

561999912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23416672 (or 23416668 counting only the distinct ones).

The product of its digits is 393660, while the sum is 51.

The square root of 561999912 is about 23706.5373262313. The cubic root of 561999912 is about 825.2371094411.

The spelling of 561999912 in words is "five hundred sixty-one million, nine hundred ninety-nine thousand, nine hundred twelve".