11143281 has 8 divisors (see below), whose sum is σ = 14883264. Its totient is φ = 7416080.

The previous prime is 11143273. The next prime is 11143283. The reversal of 11143281 is 18234111.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 11143281 - 2³ = 11143273 is a prime.

It is a super-2 number, since 2×11143281² = 248345422889922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11143283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 930 + ... + 4811.

It is an arithmetic number, because the mean of its divisors is an integer number (1860408).

Almost surely, 2^11143281 is an apocalyptic number.

It is an amenable number.

11143281 is a deficient number, since it is larger than the sum of its proper divisors (3739983).

11143281 is an equidigital number, since it uses as much as digits as its factorization.

11143281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6391.

The product of its digits is 192, while the sum is 21.

The square root of 11143281 is about 3338.1553289205. The cubic root of 11143281 is about 223.3594650247.

Adding to 11143281 its reverse (18234111), we get a palindrome (29377392).

The spelling of 11143281 in words is "eleven million, one hundred forty-three thousand, two hundred eighty-one".