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1143 = 32127
BaseRepresentation
bin10001110111
31120100
4101313
514033
65143
73222
oct2167
91510
101143
1194a
127b3
1369c
145b9
15513
hex477

1143 has 6 divisors (see below), whose sum is σ = 1664. Its totient is φ = 756.

The previous prime is 1129. The next prime is 1151. The reversal of 1143 is 3411.

Adding to 1143 its reverse (3411), we get a palindrome (4554).

It can be divided in two parts, 1 and 143, that added together give a square (144 = 122).

It is not a de Polignac number, because 1143 - 28 = 887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 127 = 1143 / (1 + 1 + 4 + 3).

It is a Duffinian number.

It is a plaindrome in base 13 and base 16.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55 + ... + 72.

1143 is a deficient number, since it is larger than the sum of its proper divisors (521).

1143 is a wasteful number, since it uses less digits than its factorization.

1143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133 (or 130 counting only the distinct ones).

The product of its digits is 12, while the sum is 9.

The square root of 1143 is about 33.8082830088. The cubic root of 1143 is about 10.4555947850.

The spelling of 1143 in words is "one thousand, one hundred forty-three", and thus it is an iban number.

Divisors: 1 3 9 127 381 1143