11661109 has 4 divisors (see below), whose sum is σ = 11731104. Its totient is φ = 11591116.

The previous prime is 11661101. The next prime is 11661119. The reversal of 11661109 is 90116611.

11661109 is digitally balanced in base 3, 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 Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90116611 = 13 ⋅6932047.

It is a cyclic number.

It is not a de Polignac number, because 11661109 - 2³ = 11661101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661101) 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, 34747 + ... + 35080.

It is an arithmetic number, because the mean of its divisors is an integer number (2932776).

Almost surely, 2^11661109 is an apocalyptic number.

It is an amenable number.

11661109 is a deficient number, since it is larger than the sum of its proper divisors (69995).

11661109 is an equidigital number, since it uses as much as digits as its factorization.

11661109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69994.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 11661109 is about 3414.8365993119. The cubic root of 11661109 is about 226.7670506440.

The spelling of 11661109 in words is "eleven million, six hundred sixty-one thousand, one hundred nine".