8671151981 has 2 divisors, whose sum is σ = 8671151982. Its totient is φ = 8671151980.

The previous prime is 8671151947. The next prime is 8671152001. The reversal of 8671151981 is 1891511768.

8671151981 is digitally balanced in base 2, 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., 8544229225 + 126922756 = 92435^2 + 11266^2 .

It is a cyclic number.

It is not a de Polignac number, because 8671151981 - 2⁶ = 8671151917 is a prime.

It is a super-2 number, since 2×8671151981² (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 (8671351981) 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, 4335575990 + 4335575991.

It is an arithmetic number, because the mean of its divisors is an integer number (4335575991).

Almost surely, 2^8671151981 is an apocalyptic number.

It is an amenable number.

8671151981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8671151981 is an equidigital number, since it uses as much as digits as its factorization.

8671151981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 47.

The square root of 8671151981 is about 93119.0205113864. The cubic root of 8671151981 is about 2054.4343417788.

The spelling of 8671151981 in words is "eight billion, six hundred seventy-one million, one hundred fifty-one thousand, nine hundred eighty-one".