11866081 has 2 divisors, whose sum is σ = 11866082. Its totient is φ = 11866080.

The previous prime is 11866079. The next prime is 11866109. The reversal of 11866081 is 18066811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11840481 + 25600 = 3441^2 + 160^2 .It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 18099811 and 11899081.

It is a cyclic number.

It is not a de Polignac number, because 11866081 - 2¹ = 11866079 is a prime.

It is a super-2 number, since 2×11866081² = 281607756597122, which contains 22 as substring.

Together with 11866079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11866031) 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, 5933040 + 5933041.

It is an arithmetic number, because the mean of its divisors is an integer number (5933041).

Almost surely, 2^11866081 is an apocalyptic number.

It is an amenable number.

11866081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11866081 is an equidigital number, since it uses as much as digits as its factorization.

11866081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 11866081 is about 3444.7178404043. The cubic root of 11866081 is about 228.0879995286.

The spelling of 11866081 in words is "eleven million, eight hundred sixty-six thousand, eighty-one".