11606581 has 6 divisors (see below), whose sum is σ = 13501590. Its totient is φ = 9948456.

The previous prime is 11606561. The next prime is 11606591. The reversal of 11606581 is 18560611.

It can be written as a sum of positive squares in only one way, i.e., 10504081 + 1102500 = 3241^2 + 1050^2 .

It is not a de Polignac number, because 11606581 - 2⁹ = 11606069 is a prime.

It is a super-2 number, since 2×11606581² = 269425445019122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11606501) 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 5 ways as a sum of consecutive naturals, for example, 118386 + ... + 118483.

It is an arithmetic number, because the mean of its divisors is an integer number (2250265).

Almost surely, 2^11606581 is an apocalyptic number.

It is an amenable number.

11606581 is a deficient number, since it is larger than the sum of its proper divisors (1895009).

11606581 is an equidigital number, since it uses as much as digits as its factorization.

11606581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236883 (or 236876 counting only the distinct ones).

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

The square root of 11606581 is about 3406.8432602631. The cubic root of 11606581 is about 226.4130397934.

The spelling of 11606581 in words is "eleven million, six hundred six thousand, five hundred eighty-one".