561618441 has 12 divisors (see below), whose sum is σ = 841272432. Its totient is φ = 374412132.

The previous prime is 561618427. The next prime is 561618493. The reversal of 561618441 is 144816165.

561618441 is a `hidden beast` number, since 56 + 161 + 8 + 441 = 666.

It is not a de Polignac number, because 561618441 - 2¹⁷ = 561487369 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561618396 and 561618405.

It is not an unprimeable number, because it can be changed into a prime (561618401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1155351 + ... + 1155836.

It is an arithmetic number, because the mean of its divisors is an integer number (70106036).

Almost surely, 2^561618441 is an apocalyptic number.

It is an amenable number.

561618441 is a deficient number, since it is larger than the sum of its proper divisors (279653991).

561618441 is an equidigital number, since it uses as much as digits as its factorization.

561618441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2311202 (or 2311190 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 561618441 is about 23698.4902683694. The cubic root of 561618441 is about 825.0503506460.

The spelling of 561618441 in words is "five hundred sixty-one million, six hundred eighteen thousand, four hundred forty-one".