8708318981 has 2 divisors, whose sum is σ = 8708318982. Its totient is φ = 8708318980.

The previous prime is 8708318953. The next prime is 8708318989. The reversal of 8708318981 is 1898138078.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8052190756 + 656128225 = 89734^2 + 25615^2 .

It is a cyclic number.

It is not a de Polignac number, because 8708318981 - 2⁶ = 8708318917 is a prime.

It is a super-2 number, since 2×8708318981² (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 (8708318989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4354159490 + 4354159491.

It is an arithmetic number, because the mean of its divisors is an integer number (4354159491).

Almost surely, 2^8708318981 is an apocalyptic number.

It is an amenable number.

8708318981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8708318981 is an equidigital number, since it uses as much as digits as its factorization.

8708318981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 774144, while the sum is 53.

The square root of 8708318981 is about 93318.3742946693. The cubic root of 8708318981 is about 2057.3654526736.

The spelling of 8708318981 in words is "eight billion, seven hundred eight million, three hundred eighteen thousand, nine hundred eighty-one".