8591665891 has 2 divisors, whose sum is σ = 8591665892. Its totient is φ = 8591665890.

The previous prime is 8591665883. The next prime is 8591665897. The reversal of 8591665891 is 1985661958.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8591665891 - 2³ = 8591665883 is a prime.

It is not a weakly prime, because it can be changed into another prime (8591665897) 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, 4295832945 + 4295832946.

It is an arithmetic number, because the mean of its divisors is an integer number (4295832946).

Almost surely, 2^8591665891 is an apocalyptic number.

8591665891 is a deficient number, since it is larger than the sum of its proper divisors (1).

8591665891 is an equidigital number, since it uses as much as digits as its factorization.

8591665891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4665600, while the sum is 58.

The square root of 8591665891 is about 92691.2395590867. The cubic root of 8591665891 is about 2048.1375820397.

The spelling of 8591665891 in words is "eight billion, five hundred ninety-one million, six hundred sixty-five thousand, eight hundred ninety-one".