11501813 has 2 divisors, whose sum is σ = 11501814. Its totient is φ = 11501812.

The previous prime is 11501801. The next prime is 11501839. The reversal of 11501813 is 31810511.

11501813 is digitally balanced in base 3, 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., 7409284 + 4092529 = 2722^2 + 2023^2 .

It is an emirp because it is prime and its reverse (31810511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11501813 - 2⁸ = 11501557 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 (11500813) 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, 5750906 + 5750907.

It is an arithmetic number, because the mean of its divisors is an integer number (5750907).

Almost surely, 2^11501813 is an apocalyptic number.

It is an amenable number.

11501813 is a deficient number, since it is larger than the sum of its proper divisors (1).

11501813 is an equidigital number, since it uses as much as digits as its factorization.

11501813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 20.

The square root of 11501813 is about 3391.4322932944. The cubic root of 11501813 is about 225.7297327881.

It can be divided in two parts, 1150181 and 3, that multiplied together give a palindrome (3450543).

The spelling of 11501813 in words is "eleven million, five hundred one thousand, eight hundred thirteen".