11681213 has 2 divisors, whose sum is σ = 11681214. Its totient is φ = 11681212.

The previous prime is 11681191. The next prime is 11681221. The reversal of 11681213 is 31218611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9972964 + 1708249 = 3158^2 + 1307^2 .

It is a cyclic number.

It is not a de Polignac number, because 11681213 - 2¹⁰ = 11680189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11681273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5840606 + 5840607.

It is an arithmetic number, because the mean of its divisors is an integer number (5840607).

Almost surely, 2^11681213 is an apocalyptic number.

It is an amenable number.

11681213 is a deficient number, since it is larger than the sum of its proper divisors (1).

11681213 is an equidigital number, since it uses as much as digits as its factorization.

11681213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 23.

The square root of 11681213 is about 3417.7789571592. The cubic root of 11681213 is about 226.8972928991.

Adding to 11681213 its reverse (31218611), we get a palindrome (42899824).

The spelling of 11681213 in words is "eleven million, six hundred eighty-one thousand, two hundred thirteen".