8618681 has 2 divisors, whose sum is σ = 8618682. Its totient is φ = 8618680.

The previous prime is 8618639. The next prime is 8618683. The reversal of 8618681 is 1868168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4477456 + 4141225 = 2116^2 + 2035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8618681 is a prime.

It is a super-2 number, since 2×8618681² = 148563324359522, which contains 22 as substring.

Together with 8618683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8618683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4309340 + 4309341.

It is an arithmetic number, because the mean of its divisors is an integer number (4309341).

Almost surely, 2^8618681 is an apocalyptic number.

It is an amenable number.

8618681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8618681 is an equidigital number, since it uses as much as digits as its factorization.

8618681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 38.

The square root of 8618681 is about 2935.7590159957. The cubic root of 8618681 is about 205.0282015534.

The spelling of 8618681 in words is "eight million, six hundred eighteen thousand, six hundred eighty-one".