8189081291 has 4 divisors (see below), whose sum is σ = 8211395232. Its totient is φ = 8166767352.

The previous prime is 8189081281. The next prime is 8189081297. The reversal of 8189081291 is 1921809818.

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

It is a cyclic number.

It is not a de Polignac number, because 8189081291 - 2⁶ = 8189081227 is a prime.

It is a super-2 number, since 2×8189081291² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8189081297) 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 3 ways as a sum of consecutive naturals, for example, 11156420 + ... + 11157153.

It is an arithmetic number, because the mean of its divisors is an integer number (2052848808).

Almost surely, 2^8189081291 is an apocalyptic number.

8189081291 is a deficient number, since it is larger than the sum of its proper divisors (22313941).

8189081291 is a wasteful number, since it uses less digits than its factorization.

8189081291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22313940.

The product of its (nonzero) digits is 82944, while the sum is 47.

The square root of 8189081291 is about 90493.5428138384. The cubic root of 8189081291 is about 2015.6342410476.

The spelling of 8189081291 in words is "eight billion, one hundred eighty-nine million, eighty-one thousand, two hundred ninety-one".