8821181 has 4 divisors (see below), whose sum is σ = 9340092. Its totient is φ = 8302272.

The previous prime is 8821151. The next prime is 8821193. The reversal of 8821181 is 1811288.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7236100 + 1585081 = 2690^2 + 1259^2 .

It is a cyclic number.

It is not a de Polignac number, because 8821181 - 2¹⁴ = 8804797 is a prime.

It is a super-2 number, since 2×8821181² = 155626468469522, which 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 (8821151) 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 3 ways as a sum of consecutive naturals, for example, 259430 + ... + 259463.

It is an arithmetic number, because the mean of its divisors is an integer number (2335023).

Almost surely, 2^8821181 is an apocalyptic number.

It is an amenable number.

8821181 is a deficient number, since it is larger than the sum of its proper divisors (518911).

8821181 is a wasteful number, since it uses less digits than its factorization.

8821181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518910.

The product of its digits is 1024, while the sum is 29.

The square root of 8821181 is about 2970.0473060206. The cubic root of 8821181 is about 206.6215322295.

The spelling of 8821181 in words is "eight million, eight hundred twenty-one thousand, one hundred eighty-one".