8182728181 has 2 divisors, whose sum is σ = 8182728182. Its totient is φ = 8182728180.

The previous prime is 8182728143. The next prime is 8182728187. The reversal of 8182728181 is 1818272818.

8182728181 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8034253956 + 148474225 = 89634^2 + 12185^2 .

It is a cyclic number.

It is not a de Polignac number, because 8182728181 - 2⁹ = 8182727669 is a prime.

It is a super-2 number, since 2×8182728181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8182728187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4091364090 + 4091364091.

It is an arithmetic number, because the mean of its divisors is an integer number (4091364091).

Almost surely, 2^8182728181 is an apocalyptic number.

It is an amenable number.

8182728181 is a deficient number, since it is larger than the sum of its proper divisors (1).

8182728181 is an equidigital number, since it uses as much as digits as its factorization.

8182728181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 114688, while the sum is 46.

The square root of 8182728181 is about 90458.4334432119. The cubic root of 8182728181 is about 2015.1128614793.

The spelling of 8182728181 in words is "eight billion, one hundred eighty-two million, seven hundred twenty-eight thousand, one hundred eighty-one".