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BaseRepresentation
bin10011000001
31200002
4103001
514332
65345
73356
oct2301
91602
101217
11a07
12855
13728
1462d
15562
hex4c1

1217 has 2 divisors, whose sum is σ = 1218. Its totient is φ = 1216.

The previous prime is 1213. The next prime is 1223. The reversal of 1217 is 7121.

Adding to 1217 its reverse (7121), we get a palindrome (8338).

It can be divided in two parts, 121 and 7, that added together give a 7-th power (128 = 27).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 961 + 256 = 31^2 + 16^2 .

It is an emirp because it is prime and its reverse (7121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1217 - 22 = 1213 is a prime.

It is a Chen prime.

It is a plaindrome in base 7.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 1198 and 1207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608 + 609.

It is an arithmetic number, because the mean of its divisors is an integer number (609).

It is a Proth number, since it is equal to 19 ⋅ 26 + 1 and 19 < 26.

21217 is an apocalyptic number.

It is an amenable number.

1217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217 is an equidigital number, since it uses as much as digits as its factorization.

1217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14, while the sum is 11.

The square root of 1217 is about 34.8855270850. The cubic root of 1217 is about 10.6765316722.

The spelling of 1217 in words is "one thousand, two hundred seventeen", and thus it is an iban number.