8491846289 has 2 divisors, whose sum is σ = 8491846290. Its totient is φ = 8491846288.

The previous prime is 8491846247. The next prime is 8491846313. The reversal of 8491846289 is 9826481948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6273907264 + 2217939025 = 79208^2 + 47095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8491846289 is a prime.

It is a super-2 number, since 2×8491846289² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8491846789) 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, 4245923144 + 4245923145.

It is an arithmetic number, because the mean of its divisors is an integer number (4245923145).

Almost surely, 2^8491846289 is an apocalyptic number.

It is an amenable number.

8491846289 is a deficient number, since it is larger than the sum of its proper divisors (1).

8491846289 is an equidigital number, since it uses as much as digits as its factorization.

8491846289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7962624, while the sum is 59.

The square root of 8491846289 is about 92151.2142567856. The cubic root of 8491846289 is about 2040.1747806965.

The spelling of 8491846289 in words is "eight billion, four hundred ninety-one million, eight hundred forty-six thousand, two hundred eighty-nine".