11181641 has 2 divisors, whose sum is σ = 11181642. Its totient is φ = 11181640.

The previous prime is 11181623. The next prime is 11181649. The reversal of 11181641 is 14618111.

11181641 is digitally balanced in base 2, 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., 10916416 + 265225 = 3304^2 + 515^2 .

It is an emirp because it is prime and its reverse (14618111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11181641 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11181649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5590820 + 5590821.

It is an arithmetic number, because the mean of its divisors is an integer number (5590821).

Almost surely, 2^11181641 is an apocalyptic number.

It is an amenable number.

11181641 is a deficient number, since it is larger than the sum of its proper divisors (1).

11181641 is an equidigital number, since it uses as much as digits as its factorization.

11181641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 23.

The square root of 11181641 is about 3343.8960809212. The cubic root of 11181641 is about 223.6154714969.

Adding to 11181641 its reverse (14618111), we get a palindrome (25799752).

The spelling of 11181641 in words is "eleven million, one hundred eighty-one thousand, six hundred forty-one".