8618861 has 2 divisors, whose sum is σ = 8618862. Its totient is φ = 8618860.

The previous prime is 8618851. The next prime is 8618867. The reversal of 8618861 is 1688168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8008900 + 609961 = 2830^2 + 781^2 .

It is a cyclic number.

It is not a de Polignac number, because 8618861 - 2¹⁰ = 8617837 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₅₇₈₆₃₉ and since 8618861 and 578639 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8618867) 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, 4309430 + 4309431.

It is an arithmetic number, because the mean of its divisors is an integer number (4309431).

Almost surely, 2^8618861 is an apocalyptic number.

It is an amenable number.

8618861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8618861 is an equidigital number, since it uses as much as digits as its factorization.

8618861 is an odious number, because the sum of its binary digits is odd.

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

The square root of 8618861 is about 2935.7896723028. The cubic root of 8618861 is about 205.0296288724.

The spelling of 8618861 in words is "eight million, six hundred eighteen thousand, eight hundred sixty-one".