12012109 has 2 divisors, whose sum is σ = 12012110. Its totient is φ = 12012108.

The previous prime is 12012101. The next prime is 12012113. The reversal of 12012109 is 90121021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11055625 + 956484 = 3325^2 + 978^2 .

It is an emirp because it is prime and its reverse (90121021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12012109 - 2³ = 12012101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12012092 and 12012101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12012101) 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 as a sum of consecutive naturals, namely, 6006054 + 6006055.

It is an arithmetic number, because the mean of its divisors is an integer number (6006055).

Almost surely, 2^12012109 is an apocalyptic number.

It is an amenable number.

12012109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012109 is an equidigital number, since it uses as much as digits as its factorization.

12012109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 12012109 is about 3465.8489580477. The cubic root of 12012109 is about 229.0198300938.

It can be divided in two parts, 12012 and 109, that added together give a palindrome (12121).

The spelling of 12012109 in words is "twelve million, twelve thousand, one hundred nine".