8518681 has 2 divisors, whose sum is σ = 8518682. Its totient is φ = 8518680.

The previous prime is 8518667. The next prime is 8518709. The reversal of 8518681 is 1868158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8503056 + 15625 = 2916^2 + 125^2 .

It is a cyclic number.

It is not a de Polignac number, because 8518681 - 2¹⁷ = 8387609 is a prime.

It is a super-2 number, since 2×8518681² = 145135851959522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8518681.

It is not a weakly prime, because it can be changed into another prime (8518661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4259340 + 4259341.

It is an arithmetic number, because the mean of its divisors is an integer number (4259341).

Almost surely, 2^8518681 is an apocalyptic number.

It is an amenable number.

8518681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8518681 is an equidigital number, since it uses as much as digits as its factorization.

8518681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15360, while the sum is 37.

The square root of 8518681 is about 2918.6779541429. The cubic root of 8518681 is about 204.2321543266.

The spelling of 8518681 in words is "eight million, five hundred eighteen thousand, six hundred eighty-one".