8215109081 has 2 divisors, whose sum is σ = 8215109082. Its totient is φ = 8215109080.

The previous prime is 8215109051. The next prime is 8215109101. The reversal of 8215109081 is 1809015128.

8215109081 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., 7976097481 + 239011600 = 89309^2 + 15460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8215109081 is a prime.

It is a super-2 number, since 2×8215109081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8215109041) 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 as a sum of consecutive naturals, namely, 4107554540 + 4107554541.

It is an arithmetic number, because the mean of its divisors is an integer number (4107554541).

Almost surely, 2^8215109081 is an apocalyptic number.

It is an amenable number.

8215109081 is a deficient number, since it is larger than the sum of its proper divisors (1).

8215109081 is an equidigital number, since it uses as much as digits as its factorization.

8215109081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 8215109081 is about 90637.2389308059. The cubic root of 8215109081 is about 2017.7674482360.

The spelling of 8215109081 in words is "eight billion, two hundred fifteen million, one hundred nine thousand, eighty-one".