12051217 has 4 divisors (see below), whose sum is σ = 12058596. Its totient is φ = 12043840.

The previous prime is 12051209. The next prime is 12051227. The reversal of 12051217 is 71215021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2954961 + 9096256 = 1719^2 + 3016^2 .

It is a cyclic number.

It is not a de Polignac number, because 12051217 - 2³ = 12051209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12051194 and 12051203.

It is not an unprimeable number, because it can be changed into a prime (12051227) 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, 28 + ... + 4909.

It is an arithmetic number, because the mean of its divisors is an integer number (3014649).

Almost surely, 2^12051217 is an apocalyptic number.

It is an amenable number.

12051217 is a deficient number, since it is larger than the sum of its proper divisors (7379).

12051217 is an equidigital number, since it uses as much as digits as its factorization.

12051217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7378.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 12051217 is about 3471.4862811194. The cubic root of 12051217 is about 229.2681019311.

Adding to 12051217 its reverse (71215021), we get a palindrome (83266238).

It can be divided in two parts, 1205121 and 7, that added together give a triangular number (1205128 = T₁₅₅₂).

The spelling of 12051217 in words is "twelve million, fifty-one thousand, two hundred seventeen".