11561213 has 2 divisors, whose sum is σ = 11561214. Its totient is φ = 11561212.

The previous prime is 11561197. The next prime is 11561219. The reversal of 11561213 is 31216511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10067929 + 1493284 = 3173^2 + 1222^2 .

It is an emirp because it is prime and its reverse (31216511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11561213 - 2⁴ = 11561197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11561219) 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, 5780606 + 5780607.

It is an arithmetic number, because the mean of its divisors is an integer number (5780607).

Almost surely, 2^11561213 is an apocalyptic number.

It is an amenable number.

11561213 is a deficient number, since it is larger than the sum of its proper divisors (1).

11561213 is an equidigital number, since it uses as much as digits as its factorization.

11561213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180, while the sum is 20.

The square root of 11561213 is about 3400.1783776737. The cubic root of 11561213 is about 226.1176522141.

Adding to 11561213 its reverse (31216511), we get a palindrome (42777724).

The spelling of 11561213 in words is "eleven million, five hundred sixty-one thousand, two hundred thirteen".