8659091891 has 2 divisors, whose sum is σ = 8659091892. Its totient is φ = 8659091890.

The previous prime is 8659091827. The next prime is 8659091893. The reversal of 8659091891 is 1981909568.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8659091891 - 2⁶ = 8659091827 is a prime.

Together with 8659091893, 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 (8659091893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4329545945 + 4329545946.

It is an arithmetic number, because the mean of its divisors is an integer number (4329545946).

Almost surely, 2^8659091891 is an apocalyptic number.

8659091891 is a deficient number, since it is larger than the sum of its proper divisors (1).

8659091891 is an equidigital number, since it uses as much as digits as its factorization.

8659091891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 56.

The square root of 8659091891 is about 93054.2416604423. The cubic root of 8659091891 is about 2053.4814442207.

The spelling of 8659091891 in words is "eight billion, six hundred fifty-nine million, ninety-one thousand, eight hundred ninety-one".