8189521447 has 2 divisors, whose sum is σ = 8189521448. Its totient is φ = 8189521446.

The previous prime is 8189521423. The next prime is 8189521463. The reversal of 8189521447 is 7441259818.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8189521447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8189521447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8189521247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4094760723 + 4094760724.

It is an arithmetic number, because the mean of its divisors is an integer number (4094760724).

Almost surely, 2^8189521447 is an apocalyptic number.

8189521447 is a deficient number, since it is larger than the sum of its proper divisors (1).

8189521447 is an equidigital number, since it uses as much as digits as its factorization.

8189521447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 49.

The square root of 8189521447 is about 90495.9747557868. The cubic root of 8189521447 is about 2015.6703532633.

The spelling of 8189521447 in words is "eight billion, one hundred eighty-nine million, five hundred twenty-one thousand, four hundred forty-seven".