11812161 has 8 divisors (see below), whose sum is σ = 16676064. Its totient is φ = 7411520.

The previous prime is 11812123. The next prime is 11812183. The reversal of 11812161 is 16121811.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11812161 - 2¹³ = 11803969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11812261) 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 7 ways as a sum of consecutive naturals, for example, 115755 + ... + 115856.

It is an arithmetic number, because the mean of its divisors is an integer number (2084508).

Almost surely, 2^11812161 is an apocalyptic number.

It is an amenable number.

11812161 is a deficient number, since it is larger than the sum of its proper divisors (4863903).

11812161 is a wasteful number, since it uses less digits than its factorization.

11812161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231631.

The product of its digits is 96, while the sum is 21.

The square root of 11812161 is about 3436.8824536198. The cubic root of 11812161 is about 227.7419942377.

Adding to 11812161 its reverse (16121811), we get a palindrome (27933972).

The spelling of 11812161 in words is "eleven million, eight hundred twelve thousand, one hundred sixty-one".