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BaseRepresentation
bin10010001001
31121000
4102021
514121
65213
73246
oct2211
91530
101161
11966
12809
136b4
145cd
15526
hex489

1161 has 8 divisors (see below), whose sum is σ = 1760. Its totient is φ = 756.

The previous prime is 1153. The next prime is 1163. The reversal of 1161 is 1611.

1161 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 1161 - 23 = 1153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a plaindrome in base 14 and base 16.

It is a nialpdrome in base 8 and base 11.

It is a zygodrome in base 8.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 1161.

It is not an unprimeable number, because it can be changed into a prime (1163) 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, 6 + ... + 48.

It is an arithmetic number, because the mean of its divisors is an integer number (220).

It is an amenable number.

1161 is a deficient number, since it is larger than the sum of its proper divisors (599).

1161 is an equidigital number, since it uses as much as digits as its factorization.

1161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52 (or 46 counting only the distinct ones).

The product of its digits is 6, while the sum is 9.

The square root of 1161 is about 34.0734500748. The cubic root of 1161 is about 10.5101941812.

Adding to 1161 its reverse (1611), we get a palindrome (2772).

The spelling of 1161 in words is "one thousand, one hundred sixty-one".

Divisors: 1 3 9 27 43 129 387 1161