1143281 has 2 divisors, whose sum is σ = 1143282. Its totient is φ = 1143280.

The previous prime is 1143269. The next prime is 1143283. The reversal of 1143281 is 1823411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 970225 + 173056 = 985^2 + 416^2 .

It is a cyclic number.

It is not a de Polignac number, because 1143281 - 2⁶ = 1143217 is a prime.

It is a super-2 number, since 2×1143281² = 2614182889922, which contains 22 as substring.

Together with 1143283, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1143283) 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 as a sum of consecutive naturals, namely, 571640 + 571641.

It is an arithmetic number, because the mean of its divisors is an integer number (571641).

2^1143281 is an apocalyptic number.

It is an amenable number.

1143281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143281 is an equidigital number, since it uses as much as digits as its factorization.

1143281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 20.

The square root of 1143281 is about 1069.2431902986. The cubic root of 1143281 is about 104.5645153079.

Adding to 1143281 its reverse (1823411), we get a palindrome (2966692).

The spelling of 1143281 in words is "one million, one hundred forty-three thousand, two hundred eighty-one".