8022181 has 4 divisors (see below), whose sum is σ = 8494092. Its totient is φ = 7550272.

The previous prime is 8022173. The next prime is 8022227. The reversal of 8022181 is 1812208.

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 4691556 + 3330625 = 2166^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 8022181 - 2³ = 8022173 is a prime.

It is a super-2 number, since 2×8022181² = 128710775993522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8022121) 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, 235930 + ... + 235963.

It is an arithmetic number, because the mean of its divisors is an integer number (2123523).

Almost surely, 2^8022181 is an apocalyptic number.

It is an amenable number.

8022181 is a deficient number, since it is larger than the sum of its proper divisors (471911).

8022181 is a wasteful number, since it uses less digits than its factorization.

8022181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471910.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 8022181 is about 2832.3454944621. The cubic root of 8022181 is about 200.1846710971.

Adding to 8022181 its reverse (1812208), we get a palindrome (9834389).

The spelling of 8022181 in words is "eight million, twenty-two thousand, one hundred eighty-one".