11243581 has 4 divisors (see below), whose sum is σ = 11427964. Its totient is φ = 11059200.

The previous prime is 11243569. The next prime is 11243593. The reversal of 11243581 is 18534211.

11243581 is digitally balanced in base 2 and base 3, because in such bases 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: 18534211 = 239 ⋅77549.

It is an interprime number because it is at equal distance from previous prime (11243569) and next prime (11243593).

It can be written as a sum of positive squares in 2 ways, for example, as 4305625 + 6937956 = 2075^2 + 2634^2 .

It is a 7-Lehmer number, since φ(11243581) divides (11243581-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 11243581 - 2¹⁵ = 11210813 is a prime.

It is a super-2 number, since 2×11243581² = 252836227407122, 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 (11244581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92100 + ... + 92221.

It is an arithmetic number, because the mean of its divisors is an integer number (2856991).

Almost surely, 2^11243581 is an apocalyptic number.

It is an amenable number.

11243581 is a deficient number, since it is larger than the sum of its proper divisors (184383).

11243581 is an equidigital number, since it uses as much as digits as its factorization.

11243581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184382.

The product of its digits is 960, while the sum is 25.

The square root of 11243581 is about 3353.1449416928. The cubic root of 11243581 is about 224.0276127206.

Adding to 11243581 its reverse (18534211), we get a palindrome (29777792).

The spelling of 11243581 in words is "eleven million, two hundred forty-three thousand, five hundred eighty-one".