8071681889 has 4 divisors (see below), whose sum is σ = 8546486724. Its totient is φ = 7596877056.

The previous prime is 8071681883. The next prime is 8071681907. The reversal of 8071681889 is 9881861708.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7059360400 + 1012321489 = 84020^2 + 31817^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8071681889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8071681883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237402392 + ... + 237402425.

It is an arithmetic number, because the mean of its divisors is an integer number (2136621681).

Almost surely, 2^8071681889 is an apocalyptic number.

It is an amenable number.

8071681889 is a deficient number, since it is larger than the sum of its proper divisors (474804835).

8071681889 is a wasteful number, since it uses less digits than its factorization.

8071681889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474804834.

The product of its (nonzero) digits is 1548288, while the sum is 56.

The square root of 8071681889 is about 89842.5394175832. The cubic root of 8071681889 is about 2005.9557377394.

The spelling of 8071681889 in words is "eight billion, seventy-one million, six hundred eighty-one thousand, eight hundred eighty-nine".