8512981817 has 2 divisors, whose sum is σ = 8512981818. Its totient is φ = 8512981816.

The previous prime is 8512981811. The next prime is 8512981907. The reversal of 8512981817 is 7181892158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6133395856 + 2379585961 = 78316^2 + 48781^2 .

It is a cyclic number.

It is not a de Polignac number, because 8512981817 - 2⁶ = 8512981753 is a prime.

It is not a weakly prime, because it can be changed into another prime (8512981811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4256490908 + 4256490909.

It is an arithmetic number, because the mean of its divisors is an integer number (4256490909).

Almost surely, 2^8512981817 is an apocalyptic number.

It is an amenable number.

8512981817 is a deficient number, since it is larger than the sum of its proper divisors (1).

8512981817 is an equidigital number, since it uses as much as digits as its factorization.

8512981817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 50.

The square root of 8512981817 is about 92265.8214996214. The cubic root of 8512981817 is about 2041.8659891372.

The spelling of 8512981817 in words is "eight billion, five hundred twelve million, nine hundred eighty-one thousand, eight hundred seventeen".