8109181 has 4 divisors (see below), whose sum is σ = 8536000. Its totient is φ = 7682364.

The previous prime is 8109173. The next prime is 8109191. The reversal of 8109181 is 1819018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8109181 - 2³ = 8109173 is a prime.

It is a super-2 number, since 2×8109181² = 131517632981522, 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 (8109131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213381 + ... + 213418.

It is an arithmetic number, because the mean of its divisors is an integer number (2134000).

Almost surely, 2^8109181 is an apocalyptic number.

It is an amenable number.

8109181 is a deficient number, since it is larger than the sum of its proper divisors (426819).

8109181 is a wasteful number, since it uses less digits than its factorization.

8109181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426818.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 8109181 is about 2847.6623746505. The cubic root of 8109181 is about 200.9057337071.

The spelling of 8109181 in words is "eight million, one hundred nine thousand, one hundred eighty-one".