8871561943 has 4 divisors (see below), whose sum is σ = 8871894880. Its totient is φ = 8871229008.

The previous prime is 8871561929. The next prime is 8871561973. The reversal of 8871561943 is 3491651788.

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 8871561943 - 2³³ = 281627351 is a prime.

It is a super-2 number, since 2×8871561943² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8871561973) 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, 122655 + ... + 181072.

It is an arithmetic number, because the mean of its divisors is an integer number (2217973720).

Almost surely, 2^8871561943 is an apocalyptic number.

8871561943 is a deficient number, since it is larger than the sum of its proper divisors (332937).

8871561943 is a wasteful number, since it uses less digits than its factorization.

8871561943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332936.

The product of its digits is 1451520, while the sum is 52.

The square root of 8871561943 is about 94188.9693276235. The cubic root of 8871561943 is about 2070.1414905580.

The spelling of 8871561943 in words is "eight billion, eight hundred seventy-one million, five hundred sixty-one thousand, nine hundred forty-three".