8644521497 has 2 divisors, whose sum is σ = 8644521498. Its totient is φ = 8644521496.

The previous prime is 8644521493. The next prime is 8644521541. The reversal of 8644521497 is 7941254468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4515302416 + 4129219081 = 67196^2 + 64259^2 .

It is a cyclic number.

It is not a de Polignac number, because 8644521497 - 2² = 8644521493 is a prime.

It is not a weakly prime, because it can be changed into another prime (8644521491) 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, 4322260748 + 4322260749.

It is an arithmetic number, because the mean of its divisors is an integer number (4322260749).

Almost surely, 2^8644521497 is an apocalyptic number.

It is an amenable number.

8644521497 is a deficient number, since it is larger than the sum of its proper divisors (1).

8644521497 is an equidigital number, since it uses as much as digits as its factorization.

8644521497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 50.

The square root of 8644521497 is about 92975.9189091455. The cubic root of 8644521497 is about 2052.3290204006.

The spelling of 8644521497 in words is "eight billion, six hundred forty-four million, five hundred twenty-one thousand, four hundred ninety-seven".