11681081 has 2 divisors, whose sum is σ = 11681082. Its totient is φ = 11681080.

The previous prime is 11681077. The next prime is 11681093. The reversal of 11681081 is 18018611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9765625 + 1915456 = 3125^2 + 1384^2 .

It is a cyclic number.

It is not a de Polignac number, because 11681081 - 2² = 11681077 is a prime.

It is a super-2 number, since 2×11681081² = 272895306657122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11681081.

It is not a weakly prime, because it can be changed into another prime (11681881) 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 as a sum of consecutive naturals, namely, 5840540 + 5840541.

It is an arithmetic number, because the mean of its divisors is an integer number (5840541).

Almost surely, 2^11681081 is an apocalyptic number.

It is an amenable number.

11681081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11681081 is an equidigital number, since it uses as much as digits as its factorization.

11681081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 26.

The square root of 11681081 is about 3417.7596463180. The cubic root of 11681081 is about 226.8964382345.

Adding to 11681081 its reverse (18018611), we get a palindrome (29699692).

The spelling of 11681081 in words is "eleven million, six hundred eighty-one thousand, eighty-one".