8656891 has 2 divisors, whose sum is σ = 8656892. Its totient is φ = 8656890.

The previous prime is 8656871. The next prime is 8656897. The reversal of 8656891 is 1986568.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8656891 - 2⁹ = 8656379 is a prime.

It is not a weakly prime, because it can be changed into another prime (8656897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4328445 + 4328446.

It is an arithmetic number, because the mean of its divisors is an integer number (4328446).

Almost surely, 2^8656891 is an apocalyptic number.

8656891 is a deficient number, since it is larger than the sum of its proper divisors (1).

8656891 is an equidigital number, since it uses as much as digits as its factorization.

8656891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 43.

The square root of 8656891 is about 2942.2595058900. The cubic root of 8656891 is about 205.3307450926.

The spelling of 8656891 in words is "eight million, six hundred fifty-six thousand, eight hundred ninety-one".