8181109 has 4 divisors (see below), whose sum is σ = 8187520. Its totient is φ = 8174700.

The previous prime is 8181091. The next prime is 8181119. The reversal of 8181109 is 9011818.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8181109 - 2⁹ = 8180597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8181119) 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, 567 + ... + 4084.

It is an arithmetic number, because the mean of its divisors is an integer number (2046880).

Almost surely, 2^8181109 is an apocalyptic number.

It is an amenable number.

8181109 is a deficient number, since it is larger than the sum of its proper divisors (6411).

8181109 is a wasteful number, since it uses less digits than its factorization.

8181109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6410.

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

The square root of 8181109 is about 2860.2637990227. The cubic root of 8181109 is about 201.4979937283.

The spelling of 8181109 in words is "eight million, one hundred eighty-one thousand, one hundred nine".