11208581 has 4 divisors (see below), whose sum is σ = 11225100. Its totient is φ = 11192064.

The previous prime is 11208553. The next prime is 11208619. The reversal of 11208581 is 18580211.

11208581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18580211 = 13 ⋅1429247.

It can be written as a sum of positive squares in 2 ways, for example, as 872356 + 10336225 = 934^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 11208581 - 2⁶ = 11208517 is a prime.

It is a super-2 number, since 2×11208581² = 251264576067122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11208581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11208551) 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 3 ways as a sum of consecutive naturals, for example, 7196 + ... + 8613.

It is an arithmetic number, because the mean of its divisors is an integer number (2806275).

Almost surely, 2^11208581 is an apocalyptic number.

It is an amenable number.

11208581 is a deficient number, since it is larger than the sum of its proper divisors (16519).

11208581 is an equidigital number, since it uses as much as digits as its factorization.

11208581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16518.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 11208581 is about 3347.9218927568. The cubic root of 11208581 is about 223.7949135310.

Adding to 11208581 its reverse (18580211), we get a palindrome (29788792).

The spelling of 11208581 in words is "eleven million, two hundred eight thousand, five hundred eighty-one".