11709161 has 4 divisors (see below), whose sum is σ = 11829972. Its totient is φ = 11588352.

The previous prime is 11709151. The next prime is 11709163. The reversal of 11709161 is 16190711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16190711 = 31 ⋅522281.

It can be written as a sum of positive squares in 2 ways, for example, as 5736025 + 5973136 = 2395^2 + 2444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11709161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11709161.

It is not an unprimeable number, because it can be changed into a prime (11709163) 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 in 3 ways as a sum of consecutive naturals, for example, 60260 + ... + 60453.

It is an arithmetic number, because the mean of its divisors is an integer number (2957493).

Almost surely, 2^11709161 is an apocalyptic number.

It is an amenable number.

11709161 is a deficient number, since it is larger than the sum of its proper divisors (120811).

11709161 is an equidigital number, since it uses as much as digits as its factorization.

11709161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120810.

The product of its (nonzero) digits is 378, while the sum is 26.

The square root of 11709161 is about 3421.8651346890. The cubic root of 11709161 is about 227.0781038850.

Adding to 11709161 its reverse (16190711), we get a palindrome (27899872).

The spelling of 11709161 in words is "eleven million, seven hundred nine thousand, one hundred sixty-one".