11218013 has 2 divisors, whose sum is σ = 11218014. Its totient is φ = 11218012.

The previous prime is 11217991. The next prime is 11218049. The reversal of 11218013 is 31081211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11035684 + 182329 = 3322^2 + 427^2 .

It is a cyclic number.

It is not a de Polignac number, because 11218013 - 2⁶ = 11217949 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11217982 and 11218000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11218073) 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, 5609006 + 5609007.

It is an arithmetic number, because the mean of its divisors is an integer number (5609007).

Almost surely, 2^11218013 is an apocalyptic number.

It is an amenable number.

11218013 is a deficient number, since it is larger than the sum of its proper divisors (1).

11218013 is an equidigital number, since it uses as much as digits as its factorization.

11218013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 11218013 is about 3349.3302315538. The cubic root of 11218013 is about 223.8576702652.

Adding to 11218013 its reverse (31081211), we get a palindrome (42299224).

The spelling of 11218013 in words is "eleven million, two hundred eighteen thousand, thirteen".