11581066 has 16 divisors (see below), whose sum is σ = 19900800. Its totient is φ = 4951440.

The previous prime is 11581049. The next prime is 11581067. The reversal of 11581066 is 66018511.

It is not an unprimeable number, because it can be changed into a prime (11581067) 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, 7696 + ... + 9076.

It is an arithmetic number, because the mean of its divisors is an integer number (1243800).

Almost surely, 2^11581066 is an apocalyptic number.

11581066 is a deficient number, since it is larger than the sum of its proper divisors (8319734).

11581066 is a wasteful number, since it uses less digits than its factorization.

11581066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 11581066 is about 3403.0965311022. The cubic root of 11581066 is about 226.2470084970.

Adding to 11581066 its reverse (66018511), we get a palindrome (77599577).

The spelling of 11581066 in words is "eleven million, five hundred eighty-one thousand, sixty-six".