11947109 has 4 divisors (see below), whose sum is σ = 11958060. Its totient is φ = 11936160.

The previous prime is 11947081. The next prime is 11947123. The reversal of 11947109 is 90174911.

It is a happy number.

11947109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6235009 + 5712100 = 2497^2 + 2390^2 .

It is a cyclic number.

It is not a de Polignac number, because 11947109 - 2⁸ = 11946853 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11947129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3632 + ... + 6089.

It is an arithmetic number, because the mean of its divisors is an integer number (2989515).

Almost surely, 2^11947109 is an apocalyptic number.

It is an amenable number.

11947109 is a deficient number, since it is larger than the sum of its proper divisors (10951).

11947109 is an equidigital number, since it uses as much as digits as its factorization.

11947109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10950.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 11947109 is about 3456.4590262290. The cubic root of 11947109 is about 228.6059915554.

The spelling of 11947109 in words is "eleven million, nine hundred forty-seven thousand, one hundred nine".