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13561 = 71191
BaseRepresentation
bin11010011111001
3200121021
43103321
5413221
6142441
754352
oct32371
920537
1013561
11a209
127a21
136232
144d29
154041
hex34f9

13561 has 4 divisors (see below), whose sum is σ = 13824. Its totient is φ = 13300.

The previous prime is 13553. The next prime is 13567. The reversal of 13561 is 16531.

13561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16531 = 61271.

It is a cyclic number.

It is not a de Polignac number, because 13561 - 23 = 13553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13567) 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, 25 + ... + 166.

It is an arithmetic number, because the mean of its divisors is an integer number (3456).

213561 is an apocalyptic number.

It is an amenable number.

13561 is a deficient number, since it is larger than the sum of its proper divisors (263).

13561 is an equidigital number, since it uses as much as digits as its factorization.

13561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262.

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

The square root of 13561 is about 116.4517067286. The cubic root of 13561 is about 23.8468254033.

It can be divided in two parts, 135 and 61, that added together give a square (196 = 142).

The spelling of 13561 in words is "thirteen thousand, five hundred sixty-one".

Divisors: 1 71 191 13561