8641643 has 2 divisors, whose sum is σ = 8641644. Its totient is φ = 8641642.

The previous prime is 8641631. The next prime is 8641651. The reversal of 8641643 is 3461468.

8641643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8641643 - 2¹⁶ = 8576107 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8641603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4320821 + 4320822.

It is an arithmetic number, because the mean of its divisors is an integer number (4320822).

Almost surely, 2^8641643 is an apocalyptic number.

8641643 is a deficient number, since it is larger than the sum of its proper divisors (1).

8641643 is an equidigital number, since it uses as much as digits as its factorization.

8641643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 32.

The square root of 8641643 is about 2939.6671580300. The cubic root of 8641643 is about 205.2101196772.

The spelling of 8641643 in words is "eight million, six hundred forty-one thousand, six hundred forty-three".