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13661 = 19719
BaseRepresentation
bin11010101011101
3200201222
43111131
5414121
6143125
754554
oct32535
920658
1013661
11a29a
127aa5
1362ab
144d9b
1540ab
hex355d

13661 has 4 divisors (see below), whose sum is σ = 14400. Its totient is φ = 12924.

The previous prime is 13649. The next prime is 13669. The reversal of 13661 is 16631.

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.

It is a cyclic number.

It is not a de Polignac number, because 13661 - 26 = 13597 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13669) 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, 341 + ... + 378.

It is an arithmetic number, because the mean of its divisors is an integer number (3600).

213661 is an apocalyptic number.

It is an amenable number.

13661 is a deficient number, since it is larger than the sum of its proper divisors (739).

13661 is an equidigital number, since it uses as much as digits as its factorization.

13661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738.

The product of its digits is 108, while the sum is 17.

The square root of 13661 is about 116.8802806294. The cubic root of 13661 is about 23.9052981024.

The spelling of 13661 in words is "thirteen thousand, six hundred sixty-one".

Divisors: 1 19 719 13661