12181109 has 8 divisors (see below), whose sum is σ = 13236480. Its totient is φ = 11167200.

The previous prime is 12181087. The next prime is 12181111. The reversal of 12181109 is 90118121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12181109 - 2¹⁶ = 12115573 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 (12181139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9752 + ... + 10929.

It is an arithmetic number, because the mean of its divisors is an integer number (1654560).

Almost surely, 2^12181109 is an apocalyptic number.

12181109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12181109 is a deficient number, since it is larger than the sum of its proper divisors (1055371).

12181109 is a wasteful number, since it uses less digits than its factorization.

12181109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20731.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 12181109 is about 3490.1445528803. The cubic root of 12181109 is about 230.0888692492.

It can be divided in two parts, 121 and 81109, that multiplied together give a palindrome (9814189).

The spelling of 12181109 in words is "twelve million, one hundred eighty-one thousand, one hundred nine".