8115991271 has 2 divisors, whose sum is σ = 8115991272. Its totient is φ = 8115991270.

The previous prime is 8115991253. The next prime is 8115991309. The reversal of 8115991271 is 1721995118.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8115991271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8115991231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4057995635 + 4057995636.

It is an arithmetic number, because the mean of its divisors is an integer number (4057995636).

Almost surely, 2^8115991271 is an apocalyptic number.

8115991271 is a deficient number, since it is larger than the sum of its proper divisors (1).

8115991271 is an equidigital number, since it uses as much as digits as its factorization.

8115991271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 44.

The square root of 8115991271 is about 90088.7965898091. The cubic root of 8115991271 is about 2009.6195967488.

The spelling of 8115991271 in words is "eight billion, one hundred fifteen million, nine hundred ninety-one thousand, two hundred seventy-one".