11681216 has 14 divisors (see below), whose sum is σ = 23180040. Its totient is φ = 5840576.

The previous prime is 11681213. The next prime is 11681221. The reversal of 11681216 is 61218611.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11681213) 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 as a sum of consecutive naturals, namely, 91196 + ... + 91323.

Almost surely, 2^11681216 is an apocalyptic number.

11681216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11681216 is a deficient number, since it is larger than the sum of its proper divisors (11498824).

11681216 is an equidigital number, since it uses as much as digits as its factorization.

11681216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182531 (or 182521 counting only the distinct ones).

The product of its digits is 576, while the sum is 26.

The square root of 11681216 is about 3417.7793960407. The cubic root of 11681216 is about 226.8973123232.

Adding to 11681216 its reverse (61218611), we get a palindrome (72899827).

The spelling of 11681216 in words is "eleven million, six hundred eighty-one thousand, two hundred sixteen".