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13165 = 52633
BaseRepresentation
bin11001101101101
3200001121
43031231
5410130
6140541
753245
oct31555
920047
1013165
119989
127751
135cb9
144b25
153d7a
hex336d

13165 has 4 divisors (see below), whose sum is σ = 15804. Its totient is φ = 10528.

The previous prime is 13163. The next prime is 13171. The reversal of 13165 is 56131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3364 + 9801 = 58^2 + 99^2 .

It is a cyclic number.

It is not a de Polignac number, because 13165 - 21 = 13163 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1312 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (3951).

213165 is an apocalyptic number.

It is an amenable number.

13165 is a deficient number, since it is larger than the sum of its proper divisors (2639).

13165 is an equidigital number, since it uses as much as digits as its factorization.

13165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2638.

The product of its digits is 90, while the sum is 16.

The square root of 13165 is about 114.7388338794. The cubic root of 13165 is about 23.6124084895.

Adding to 13165 its reverse (56131), we get a palindrome (69296).

It can be divided in two parts, 131 and 65, that multiplied together give a triangular number (8515 = T130).

The spelling of 13165 in words is "thirteen thousand, one hundred sixty-five".

Divisors: 1 5 2633 13165