11185681 has 8 divisors (see below), whose sum is σ = 12089000. Its totient is φ = 10288512.

The previous prime is 11185679. The next prime is 11185693. The reversal of 11185681 is 18658111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1476225 + 9709456 = 1215^2 + 3116^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11185681 - 2¹ = 11185679 is a prime.

It is a super-2 number, since 2×11185681² = 250238918867522, which contains 22 as substring.

It is the 3345-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11185081) by changing a digit.

It is a nontrivial repunit in base 3344.

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, 2695 + ... + 5443.

It is an arithmetic number, because the mean of its divisors is an integer number (1511125).

Almost surely, 2^11185681 is an apocalyptic number.

It is an amenable number.

11185681 is a deficient number, since it is larger than the sum of its proper divisors (903319).

11185681 is a wasteful number, since it uses less digits than its factorization.

11185681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3075.

The product of its digits is 1920, while the sum is 31.

The square root of 11185681 is about 3344.5001121244. The cubic root of 11185681 is about 223.6423994980.

The spelling of 11185681 in words is "eleven million, one hundred eighty-five thousand, six hundred eighty-one".