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BaseRepresentation
bin110101000001110001
3102000221111
4311001301
523422301
64353321
71563145
oct650161
9360844
10217201
11139206
12a5841
1377b2a
1459225
1544551
hex35071

217201 has 2 divisors, whose sum is σ = 217202. Its totient is φ = 217200.

The previous prime is 217199. The next prime is 217207. The reversal of 217201 is 102712.

Adding to 217201 its reverse (102712), we get a palindrome (319913).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112225 + 104976 = 335^2 + 324^2 .

It is a cyclic number.

It is not a de Polignac number, because 217201 - 21 = 217199 is a prime.

Together with 217199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (217207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108600 + 108601.

It is an arithmetic number, because the mean of its divisors is an integer number (108601).

2217201 is an apocalyptic number.

It is an amenable number.

217201 is a deficient number, since it is larger than the sum of its proper divisors (1).

217201 is an equidigital number, since it uses as much as digits as its factorization.

217201 is an evil number, because the sum of its binary digits is even.

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

The square root of 217201 is about 466.0482807607. The cubic root of 217201 is about 60.1109982336.

The spelling of 217201 in words is "two hundred seventeen thousand, two hundred one", and thus it is an iban number.