561389544 has 24 divisors (see below), whose sum is σ = 1520430210. Its totient is φ = 187129824.

The previous prime is 561389539. The next prime is 561389551. The reversal of 561389544 is 445983165.

561389544 is a `hidden beast` number, since 561 + 3 + 89 + 5 + 4 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 297976644 + 263412900 = 17262^2 + 16230^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×561389544² = 630316440225055872, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 561389544.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3898467 + ... + 3898610.

Almost surely, 2^561389544 is an apocalyptic number.

It is an amenable number.

561389544 is an abundant number, since it is smaller than the sum of its proper divisors (959040666).

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

561389544 is a wasteful number, since it uses less digits than its factorization.

561389544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7797089 (or 7797082 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 561389544 is about 23693.6604179261. The cubic root of 561389544 is about 824.9382477195.

The spelling of 561389544 in words is "five hundred sixty-one million, three hundred eighty-nine thousand, five hundred forty-four".