| Base | Representation |
|---|---|
| bin | 101110001101… |
| … | …000011101101 |
| 3 | 211210100200122 |
| 4 | 232031003231 |
| 5 | 11100041414 |
| 6 | 1111334325 |
| 7 | 204644162 |
| oct | 56150355 |
| 9 | 24710618 |
| 10 | 12112109 |
| 11 | 6923009 |
| 12 | 40813a5 |
| 13 | 2681039 |
| 14 | 1874069 |
| 15 | 10e3b8e |
| hex | b8d0ed |
12112109 has 4 divisors (see below), whose sum is σ = 12824604. Its totient is φ = 11399616.
The previous prime is 12112069. The next prime is 12112127. The reversal of 12112109 is 90121121.
12112109 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
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 9060100 + 3052009 = 3010^2 + 1747^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-12112109 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 712477 = 12112109 / (1 + 2 + 1 + 1 + 2 + 1 + 0 + 9).
It is a Duffinian number.
It is a Curzon number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (12112159) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356222 + ... + 356255.
It is an arithmetic number, because the mean of its divisors is an integer number (3206151).
Almost surely, 212112109 is an apocalyptic number.
It is an amenable number.
12112109 is a deficient number, since it is larger than the sum of its proper divisors (712495).
12112109 is an equidigital number, since it uses as much as digits as its factorization.
12112109 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 712494.
The product of its (nonzero) digits is 36, while the sum is 17.
The square root of 12112109 is about 3480.2455373149. The cubic root of 12112109 is about 229.6535995350.
It can be divided in two parts, 12112 and 109, that added together give a palindrome (12221).
The spelling of 12112109 in words is "twelve million, one hundred twelve thousand, one hundred nine".
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