7171089891 has 32 divisors (see below), whose sum is σ = 11417161728. Its totient is φ = 3914555040.

The previous prime is 7171089881. The next prime is 7171089901. The reversal of 7171089891 is 1989801717.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7171089881) and next prime (7171089901).

It is not a de Polignac number, because 7171089891 - 2¹⁰ = 7171088867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7171089851) 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 in 31 ways as a sum of consecutive naturals, for example, 382560 + ... + 400866.

It is an arithmetic number, because the mean of its divisors is an integer number (356786304).

Almost surely, 2^7171089891 is an apocalyptic number.

7171089891 is a deficient number, since it is larger than the sum of its proper divisors (4246071837).

7171089891 is a wasteful number, since it uses less digits than its factorization.

7171089891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19151.

The product of its (nonzero) digits is 254016, while the sum is 51.

The square root of 7171089891 is about 84682.2879414580. The cubic root of 7171089891 is about 1928.3908205323.

The spelling of 7171089891 in words is "seven billion, one hundred seventy-one million, eighty-nine thousand, eight hundred ninety-one".