8643563 has 2 divisors, whose sum is σ = 8643564. Its totient is φ = 8643562.

The previous prime is 8643539. The next prime is 8643577. The reversal of 8643563 is 3653468.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8643563 - 2⁸ = 8643307 is a prime.

It is a super-2 number, since 2×8643563² = 149422362669938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8843563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4321781 + 4321782.

It is an arithmetic number, because the mean of its divisors is an integer number (4321782).

Almost surely, 2^8643563 is an apocalyptic number.

8643563 is a deficient number, since it is larger than the sum of its proper divisors (1).

8643563 is an equidigital number, since it uses as much as digits as its factorization.

8643563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 35.

The square root of 8643563 is about 2939.9937074763. The cubic root of 8643563 is about 205.2253164113.

The spelling of 8643563 in words is "eight million, six hundred forty-three thousand, five hundred sixty-three".