11811205 has 32 divisors (see below), whose sum is σ = 16934400. Its totient is φ = 7902720.

The previous prime is 11811203. The next prime is 11811221. The reversal of 11811205 is 50211811.

It is a happy number.

It is not a de Polignac number, because 11811205 - 2¹ = 11811203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11811203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121717 + ... + 121813.

It is an arithmetic number, because the mean of its divisors is an integer number (529200).

Almost surely, 2^11811205 is an apocalyptic number.

It is an amenable number.

11811205 is a deficient number, since it is larger than the sum of its proper divisors (5123195).

11811205 is an frugal number, since it uses more digits than its factorization.

11811205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 11811205 is about 3436.7433712746. The cubic root of 11811205 is about 227.7358500834.

The spelling of 11811205 in words is "eleven million, eight hundred eleven thousand, two hundred five".