8736437981 has 2 divisors, whose sum is σ = 8736437982. Its totient is φ = 8736437980.

The previous prime is 8736437939. The next prime is 8736438001. The reversal of 8736437981 is 1897346378.

8736437981 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., 5814062500 + 2922375481 = 76250^2 + 54059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8736437981 is a prime.

It is a super-2 number, since 2×8736437981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8736437681) 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, 4368218990 + 4368218991.

It is an arithmetic number, because the mean of its divisors is an integer number (4368218991).

Almost surely, 2^8736437981 is an apocalyptic number.

It is an amenable number.

8736437981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8736437981 is an equidigital number, since it uses as much as digits as its factorization.

8736437981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6096384, while the sum is 56.

The square root of 8736437981 is about 93468.9145170735. The cubic root of 8736437981 is about 2059.5774717818.

The spelling of 8736437981 in words is "eight billion, seven hundred thirty-six million, four hundred thirty-seven thousand, nine hundred eighty-one".