561618992 has 20 divisors (see below), whose sum is σ = 1187058696. Its totient is φ = 255281280.

The previous prime is 561618989. The next prime is 561618997. The reversal of 561618992 is 299816165.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (561618997) by changing a digit.

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, 1595333 + ... + 1595684.

Almost surely, 2^561618992 is an apocalyptic number.

It is an amenable number.

561618992 is an abundant number, since it is smaller than the sum of its proper divisors (625439704).

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

561618992 is a wasteful number, since it uses less digits than its factorization.

561618992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3191036 (or 3191030 counting only the distinct ones).

The product of its digits is 233280, while the sum is 47.

The square root of 561618992 is about 23698.5018935797. The cubic root of 561618992 is about 825.0506204630.

The spelling of 561618992 in words is "five hundred sixty-one million, six hundred eighteen thousand, nine hundred ninety-two".