8143316981 has 2 divisors, whose sum is σ = 8143316982. Its totient is φ = 8143316980.

The previous prime is 8143316969. The next prime is 8143317037. The reversal of 8143316981 is 1896133418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7990572100 + 152744881 = 89390^2 + 12359^2 .

It is a cyclic number.

It is not a de Polignac number, because 8143316981 - 2¹⁴ = 8143300597 is a prime.

It is a super-2 number, since 2×8143316981² (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 (8143316941) 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, 4071658490 + 4071658491.

It is an arithmetic number, because the mean of its divisors is an integer number (4071658491).

Almost surely, 2^8143316981 is an apocalyptic number.

It is an amenable number.

8143316981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8143316981 is an equidigital number, since it uses as much as digits as its factorization.

8143316981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 44.

The square root of 8143316981 is about 90240.3290164658. The cubic root of 8143316981 is about 2011.8724645850.

The spelling of 8143316981 in words is "eight billion, one hundred forty-three million, three hundred sixteen thousand, nine hundred eighty-one".