8581211172 has 96 divisors (see below), whose sum is σ = 22599561600. Its totient is φ = 2815502976.

The previous prime is 8581211161. The next prime is 8581211179. The reversal of 8581211172 is 2711121858.

8581211172 is a `hidden beast` number, since 8 + 581 + 2 + 1 + 1 + 1 + 72 = 666.

It is a super-2 number, since 2×8581211172² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (8581211179) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1845883 + ... + 1850525.

It is an arithmetic number, because the mean of its divisors is an integer number (235412100).

Almost surely, 2^8581211172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8581211172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11299780800).

8581211172 is an abundant number, since it is smaller than the sum of its proper divisors (14018350428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8581211172 is a wasteful number, since it uses less digits than its factorization.

8581211172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4922 (or 4914 counting only the distinct ones).

The product of its digits is 8960, while the sum is 36.

The square root of 8581211172 is about 92634.8269928756. The cubic root of 8581211172 is about 2047.3064900509.

The spelling of 8581211172 in words is "eight billion, five hundred eighty-one million, two hundred eleven thousand, one hundred seventy-two".