8162181 has 16 divisors (see below), whose sum is σ = 12136320. Its totient is φ = 5421600.

The previous prime is 8162179. The next prime is 8162183. The reversal of 8162181 is 1812618.

8162181 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8162179) and next prime (8162183).

It is not a de Polignac number, because 8162181 - 2¹ = 8162179 is a prime.

It is a super-2 number, since 2×8162181² = 133242397353522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8162183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13281 + ... + 13881.

It is an arithmetic number, because the mean of its divisors is an integer number (758520).

Almost surely, 2^8162181 is an apocalyptic number.

It is an amenable number.

8162181 is a deficient number, since it is larger than the sum of its proper divisors (3974139).

8162181 is a wasteful number, since it uses less digits than its factorization.

8162181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113 (or 1107 counting only the distinct ones).

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

The square root of 8162181 is about 2856.9530972699. The cubic root of 8162181 is about 201.3424769493.

Adding to 8162181 its reverse (1812618), we get a palindrome (9974799).

The spelling of 8162181 in words is "eight million, one hundred sixty-two thousand, one hundred eighty-one".