8871567721 has 9 divisors (see below), whose sum is σ = 8952257533. Its totient is φ = 8791601260.

The previous prime is 8871567713. The next prime is 8871567739. The reversal of 8871567721 is 1277651788.

The square root of 8871567721 is 94189.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 8871567721 - 2³ = 8871567713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8871567701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12338400 + ... + 12339118.

Almost surely, 2^8871567721 is an apocalyptic number.

8871567721 is the 94189-th square number.

8871567721 is the 47095-th centered octagonal number.

It is an amenable number.

8871567721 is a deficient number, since it is larger than the sum of its proper divisors (80689812).

8871567721 is an frugal number, since it uses more digits than its factorization.

8871567721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700 (or 850 counting only the distinct ones).

The product of its digits is 1317120, while the sum is 52.

The cubic root of 8871567721 is about 2070.1419399818.

The spelling of 8871567721 in words is "eight billion, eight hundred seventy-one million, five hundred sixty-seven thousand, seven hundred twenty-one".