8543863561 has 2 divisors, whose sum is σ = 8543863562. Its totient is φ = 8543863560.

The previous prime is 8543863501. The next prime is 8543863591. The reversal of 8543863561 is 1653683458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5839863561 + 2704000000 = 76419^2 + 52000^2 .

It is a cyclic number.

It is not a de Polignac number, because 8543863561 - 2¹⁵ = 8543830793 is a prime.

It is not a weakly prime, because it can be changed into another prime (8543863501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4271931780 + 4271931781.

It is an arithmetic number, because the mean of its divisors is an integer number (4271931781).

Almost surely, 2^8543863561 is an apocalyptic number.

It is an amenable number.

8543863561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8543863561 is an equidigital number, since it uses as much as digits as its factorization.

8543863561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2073600, while the sum is 49.

The square root of 8543863561 is about 92433.0220267627. The cubic root of 8543863561 is about 2044.3320380299.

The spelling of 8543863561 in words is "eight billion, five hundred forty-three million, eight hundred sixty-three thousand, five hundred sixty-one".