11218261 has 2 divisors, whose sum is σ = 11218262. Its totient is φ = 11218260.

The previous prime is 11218253. The next prime is 11218267. The reversal of 11218261 is 16281211.

11218261 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11015761 + 202500 = 3319^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 11218261 - 2³ = 11218253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11218267) 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, 5609130 + 5609131.

It is an arithmetic number, because the mean of its divisors is an integer number (5609131).

Almost surely, 2^11218261 is an apocalyptic number.

It is an amenable number.

11218261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11218261 is an equidigital number, since it uses as much as digits as its factorization.

11218261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 22.

The square root of 11218261 is about 3349.3672536764. The cubic root of 11218261 is about 223.8593198827.

Adding to 11218261 its reverse (16281211), we get a palindrome (27499472).

The spelling of 11218261 in words is "eleven million, two hundred eighteen thousand, two hundred sixty-one".