8047871981 has 2 divisors, whose sum is σ = 8047871982. Its totient is φ = 8047871980.

The previous prime is 8047871969. The next prime is 8047871987. The reversal of 8047871981 is 1891787408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8044296100 + 3575881 = 89690^2 + 1891^2 .

It is a cyclic number.

It is not a de Polignac number, because 8047871981 - 2⁶ = 8047871917 is a prime.

It is a super-2 number, since 2×8047871981² (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 (8047871987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4023935990 + 4023935991.

It is an arithmetic number, because the mean of its divisors is an integer number (4023935991).

Almost surely, 2^8047871981 is an apocalyptic number.

It is an amenable number.

8047871981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8047871981 is an equidigital number, since it uses as much as digits as its factorization.

8047871981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 53.

The square root of 8047871981 is about 89709.9324545504. The cubic root of 8047871981 is about 2003.9814007149.

The spelling of 8047871981 in words is "eight billion, forty-seven million, eight hundred seventy-one thousand, nine hundred eighty-one".