8198389081 has 4 divisors (see below), whose sum is σ = 8332788964. Its totient is φ = 8063989200.

The previous prime is 8198389051. The next prime is 8198389103. The reversal of 8198389081 is 1809838918.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1809838918 = 2 ⋅904919459.

It can be written as a sum of positive squares in 2 ways, for example, as 511483456 + 7686905625 = 22616^2 + 87675^2 .

It is a cyclic number.

It is not a de Polignac number, because 8198389081 - 2¹¹ = 8198387033 is a prime.

It is a super-2 number, since 2×8198389081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8198389051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67199850 + ... + 67199971.

It is an arithmetic number, because the mean of its divisors is an integer number (2083197241).

Almost surely, 2^8198389081 is an apocalyptic number.

It is an amenable number.

8198389081 is a deficient number, since it is larger than the sum of its proper divisors (134399883).

8198389081 is a wasteful number, since it uses less digits than its factorization.

8198389081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134399882.

The product of its (nonzero) digits is 995328, while the sum is 55.

The square root of 8198389081 is about 90544.9561322993. The cubic root of 8198389081 is about 2016.3976151077.

The spelling of 8198389081 in words is "eight billion, one hundred ninety-eight million, three hundred eighty-nine thousand, eighty-one".