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12217 = 19643
BaseRepresentation
bin10111110111001
3121202111
42332321
5342332
6132321
750422
oct27671
917674
1012217
1191a7
1270a1
13573a
144649
153947
hex2fb9

12217 has 4 divisors (see below), whose sum is σ = 12880. Its totient is φ = 11556.

The previous prime is 12211. The next prime is 12227. The reversal of 12217 is 71221.

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: 71221 = 671063.

It is a cyclic number.

It is not a de Polignac number, because 12217 - 211 = 10169 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12197 and 12206.

It is not an unprimeable number, because it can be changed into a prime (12211) 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, 303 + ... + 340.

It is an arithmetic number, because the mean of its divisors is an integer number (3220).

212217 is an apocalyptic number.

It is an amenable number.

12217 is a deficient number, since it is larger than the sum of its proper divisors (663).

12217 is an equidigital number, since it uses as much as digits as its factorization.

12217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662.

The product of its digits is 28, while the sum is 13.

The square root of 12217 is about 110.5305387664. The cubic root of 12217 is about 23.0314629267.

Adding to 12217 its reverse (71221), we get a palindrome (83438).

The spelling of 12217 in words is "twelve thousand, two hundred seventeen", and thus it is an iban number.

Divisors: 1 19 643 12217