5663561 has 2 divisors, whose sum is σ = 5663562. Its totient is φ = 5663560.

The previous prime is 5663549. The next prime is 5663569. The reversal of 5663561 is 1653665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4923961 + 739600 = 2219^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 5663561 - 2²² = 1469257 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (5663569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2831780 + 2831781.

It is an arithmetic number, because the mean of its divisors is an integer number (2831781).

Almost surely, 2^5663561 is an apocalyptic number.

It is an amenable number.

5663561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5663561 is an equidigital number, since it uses as much as digits as its factorization.

5663561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 32.

The square root of 5663561 is about 2379.8237329685. The cubic root of 5663561 is about 178.2501322857.

The spelling of 5663561 in words is "five million, six hundred sixty-three thousand, five hundred sixty-one".