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BaseRepresentation
bin10010100101
31122001
4102211
514224
65301
73316
oct2245
91561
101189
11991
12831
13706
1460d
15544
hex4a5

1189 has 4 divisors (see below), whose sum is σ = 1260. Its totient is φ = 1120.

The previous prime is 1187. The next prime is 1193. The reversal of 1189 is 9811.

It can be divided in two parts, 11 and 89, that multiplied together give a palindrome (979).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 289 + 900 = 17^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 1189 - 21 = 1187 is a prime.

It is a Duffinian number.

1189 is a lucky number.

It is a plaindrome in base 8 and base 10.

It is a nialpdrome in base 11, base 12 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 9 + ... + 49.

It is an arithmetic number, because the mean of its divisors is an integer number (315).

It is an amenable number.

1189 is a deficient number, since it is larger than the sum of its proper divisors (71).

1189 is an equidigital number, since it uses as much as digits as its factorization.

1189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70.

The product of its digits is 72, while the sum is 19.

The square root of 1189 is about 34.4818792991. The cubic root of 1189 is about 10.5940158462.

The spelling of 1189 in words is "one thousand, one hundred eighty-nine".

Divisors: 1 29 41 1189