8217481609 has 2 divisors, whose sum is σ = 8217481610. Its totient is φ = 8217481608.

The previous prime is 8217481603. The next prime is 8217481637. The reversal of 8217481609 is 9061847128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6625471609 + 1592010000 = 81397^2 + 39900^2 .

It is a cyclic number.

It is not a de Polignac number, because 8217481609 - 2¹¹ = 8217479561 is a prime.

It is not a weakly prime, because it can be changed into another prime (8217481603) 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, 4108740804 + 4108740805.

It is an arithmetic number, because the mean of its divisors is an integer number (4108740805).

Almost surely, 2^8217481609 is an apocalyptic number.

It is an amenable number.

8217481609 is a deficient number, since it is larger than the sum of its proper divisors (1).

8217481609 is an equidigital number, since it uses as much as digits as its factorization.

8217481609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 8217481609 is about 90650.3260280955. The cubic root of 8217481609 is about 2017.9616736543.

The spelling of 8217481609 in words is "eight billion, two hundred seventeen million, four hundred eighty-one thousand, six hundred nine".