8639634491 has 2 divisors, whose sum is σ = 8639634492. Its totient is φ = 8639634490.

The previous prime is 8639634467. The next prime is 8639634539. The reversal of 8639634491 is 1944369368.

8639634491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8639634491 - 2¹⁴ = 8639618107 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (8639634401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4319817245 + 4319817246.

It is an arithmetic number, because the mean of its divisors is an integer number (4319817246).

Almost surely, 2^8639634491 is an apocalyptic number.

8639634491 is a deficient number, since it is larger than the sum of its proper divisors (1).

8639634491 is an equidigital number, since it uses as much as digits as its factorization.

8639634491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 53.

The square root of 8639634491 is about 92949.6341628088. The cubic root of 8639634491 is about 2051.9421998818.

The spelling of 8639634491 in words is "eight billion, six hundred thirty-nine million, six hundred thirty-four thousand, four hundred ninety-one".