11813 has 2 divisors, whose sum is σ = 11814. Its totient is φ = 11812.

The previous prime is 11807. The next prime is 11821. The reversal of 11813 is 31811.

11813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9604 + 2209 = 98^2 + 47^2 .

It is a cyclic number.

It is not a de Polignac number, because 11813 - 2¹⁰ = 10789 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5906 + 5907.

It is an arithmetic number, because the mean of its divisors is an integer number (5907).

2¹¹⁸¹³ is an apocalyptic number.

It is an amenable number.

11813 is a deficient number, since it is larger than the sum of its proper divisors (1).

11813 is an equidigital number, since it uses as much as digits as its factorization.

11813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24, while the sum is 14.

The square root of 11813 is about 108.6876257906. The cubic root of 11813 is about 22.7747386167.

It can be divided in two parts, 118 and 13, that added together give a palindrome (131).

The spelling of 11813 in words is "eleven thousand, eight hundred thirteen".