8091989369 has 2 divisors, whose sum is σ = 8091989370. Its totient is φ = 8091989368.

The previous prime is 8091989333. The next prime is 8091989371. The reversal of 8091989369 is 9639891908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4200724969 + 3891264400 = 64813^2 + 62380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8091989369 is a prime.

It is a super-2 number, since 2×8091989369² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 8091989371, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8091989669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4045994684 + 4045994685.

It is an arithmetic number, because the mean of its divisors is an integer number (4045994685).

Almost surely, 2^8091989369 is an apocalyptic number.

It is an amenable number.

8091989369 is a deficient number, since it is larger than the sum of its proper divisors (1).

8091989369 is an equidigital number, since it uses as much as digits as its factorization.

8091989369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7558272, while the sum is 62.

The square root of 8091989369 is about 89955.4854858780. The cubic root of 8091989369 is about 2007.6365849232.

The spelling of 8091989369 in words is "eight billion, ninety-one million, nine hundred eighty-nine thousand, three hundred sixty-nine".