8173443121 has 2 divisors, whose sum is σ = 8173443122. Its totient is φ = 8173443120.

The previous prime is 8173443097. The next prime is 8173443169. The reversal of 8173443121 is 1213443718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5619151521 + 2554291600 = 74961^2 + 50540^2 .

It is a cyclic number.

It is not a de Polignac number, because 8173443121 - 2³¹ = 6025959473 is a prime.

It is not a weakly prime, because it can be changed into another prime (8173423121) 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, 4086721560 + 4086721561.

It is an arithmetic number, because the mean of its divisors is an integer number (4086721561).

Almost surely, 2^8173443121 is an apocalyptic number.

It is an amenable number.

8173443121 is a deficient number, since it is larger than the sum of its proper divisors (1).

8173443121 is an equidigital number, since it uses as much as digits as its factorization.

8173443121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 8173443121 is about 90407.0966296341. The cubic root of 8173443121 is about 2014.3503804387.

Adding to 8173443121 its reverse (1213443718), we get a palindrome (9386886839).

The spelling of 8173443121 in words is "eight billion, one hundred seventy-three million, four hundred forty-three thousand, one hundred twenty-one".