8821161 has 12 divisors (see below), whose sum is σ = 12982788. Its totient is φ = 5769504.

The previous prime is 8821151. The next prime is 8821193. The reversal of 8821161 is 1611288.

It can be written as a sum of positive squares in 2 ways, for example, as 4995225 + 3825936 = 2235^2 + 1956^2 .

It is not a de Polignac number, because 8821161 - 2⁵ = 8821129 is a prime.

It is a plaindrome in base 14.

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 (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8770 + ... + 9723.

It is an arithmetic number, because the mean of its divisors is an integer number (1081899).

Almost surely, 2^8821161 is an apocalyptic number.

It is an amenable number.

8821161 is a deficient number, since it is larger than the sum of its proper divisors (4161627).

8821161 is a wasteful number, since it uses less digits than its factorization.

8821161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18552 (or 18549 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 8821161 is about 2970.0439390689. The cubic root of 8821161 is about 206.6213760738.

The spelling of 8821161 in words is "eight million, eight hundred twenty-one thousand, one hundred sixty-one".