1123 has 2 divisors, whose sum is σ = 1124. Its totient is φ = 1122.

The previous prime is 1117. The next prime is 1129. The reversal of 1123 is 3211.

Adding to 1123 its reverse (3211), we get a palindrome (4334).

It can be divided in two parts, 11 and 23, that multiplied together give a triangular number (253 = T_{22}).

1123 is nontrivially palindromic in base 12.

It is a m-pointer prime, because the next prime (1129) can be obtained adding 1123 to its product of digits (6).

It is a balanced prime because it is at equal distance from previous prime (1117) and next prime (1129).

It is a cyclic number.

It is not a de Polignac number, because 1123 - 2^{5} = 1091 is a prime.

It is a super-2 number, since 2×1123^{2} = 2522258, which contains 22 as substring.

It is the 34-th Hogben number.

1123 is an undulating number in base 12.

1123 is a lucky number.

It is a plaindrome in base 9 and base 10.

It is a nialpdrome in base 6 and base 11.

It is not a weakly prime, because it can be changed into another prime (1129) by changing a digit.

It is a nontrivial repunit in base 33.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561 + 562.

It is an arithmetic number, because the mean of its divisors is an integer number (562).

1123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123 is an equidigital number, since it uses as much as digits as its factorization.

1123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6, while the sum is 7.

The square root of 1123 is about 33.5111921602. The cubic root of 1123 is about 10.3942522480.

The spelling of 1123 in words is "one thousand, one hundred twenty-three", and thus it is an iban number.

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