12112805 has 4 divisors (see below), whose sum is σ = 14535372. Its totient is φ = 9690240.

The previous prime is 12112781. The next prime is 12112819. The reversal of 12112805 is 50821121.

It is a happy number.

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 3621409 + 8491396 = 1903^2 + 2914^2 .

It is not a de Polignac number, because 12112805 - 2⁶ = 12112741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1211276 + ... + 1211285.

It is an arithmetic number, because the mean of its divisors is an integer number (3633843).

Almost surely, 2^12112805 is an apocalyptic number.

It is an amenable number.

12112805 is a deficient number, since it is larger than the sum of its proper divisors (2422567).

12112805 is an equidigital number, since it uses as much as digits as its factorization.

12112805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422566.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 12112805 is about 3480.3455288233. The cubic root of 12112805 is about 229.6579983242.

Adding to 12112805 its reverse (50821121), we get a palindrome (62933926).

The spelling of 12112805 in words is "twelve million, one hundred twelve thousand, eight hundred five".