8158321081 has 12 divisors (see below), whose sum is σ = 8452598364. Its totient is φ = 7869593600.

The previous prime is 8158321069. The next prime is 8158321133. The reversal of 8158321081 is 1801238518.

8158321081 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 2884656681 + 5273664400 = 53709^2 + 72620^2 .

It is not a de Polignac number, because 8158321081 - 2²⁵ = 8124766649 is a prime.

It is a super-2 number, since 2×8158321081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8158321081.

It is not an unprimeable number, because it can be changed into a prime (8158325081) 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 in 11 ways as a sum of consecutive naturals, for example, 312201 + ... + 337321.

It is an arithmetic number, because the mean of its divisors is an integer number (704383197).

Almost surely, 2^8158321081 is an apocalyptic number.

It is an amenable number.

8158321081 is a deficient number, since it is larger than the sum of its proper divisors (294277283).

8158321081 is an equidigital number, since it uses as much as digits as its factorization.

8158321081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25340 (or 25251 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 8158321081 is about 90323.4248741709. The cubic root of 8158321081 is about 2013.1073346501.

Adding to 8158321081 its reverse (1801238518), we get a palindrome (9959559599).

The spelling of 8158321081 in words is "eight billion, one hundred fifty-eight million, three hundred twenty-one thousand, eighty-one".