11809161 has 24 divisors (see below), whose sum is σ = 20995520. Its totient is φ = 6228576.

The previous prime is 11809159. The next prime is 11809163. The reversal of 11809161 is 16190811.

11809161 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11809159) and next prime (11809163).

It is not a de Polignac number, because 11809161 - 2¹ = 11809159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11809163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6391 + ... + 8028.

Almost surely, 2^11809161 is an apocalyptic number.

It is an amenable number.

11809161 is a deficient number, since it is larger than the sum of its proper divisors (9186359).

11809161 is a wasteful number, since it uses less digits than its factorization.

11809161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14445 (or 14442 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 11809161 is about 3436.4459838618. The cubic root of 11809161 is about 227.7227123064.

Adding to 11809161 its reverse (16190811), we get a palindrome (27999972).

The spelling of 11809161 in words is "eleven million, eight hundred nine thousand, one hundred sixty-one".