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BaseRepresentation
bin11001001
321110
43021
51301
6533
7405
oct311
9243
10201
11173
12149
13126
14105
15d6
hexc9

201 has 4 divisors (see below), whose sum is σ = 272. Its totient is φ = 132.

The previous prime is 199. The next prime is 211. The reversal of 201 is 102.

Adding to 201 its reverse (102), we get a palindrome (303).

Subtracting from 201 its reverse (102), we obtain a palindrome (99).

Multipling 201 by its reverse (102), we get a palindrome (20502).

It can be divided in two parts, 20 and 1, that added together give a triangular number (21 = T6).

201 is digitally balanced in base 2 and base 4, because in such bases 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.

It is not a de Polignac number, because 201 - 21 = 199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (3), and also a Moran number because the ratio is a prime number: 67 = 201 / (2 + 0 + 1).

It is a D-number.

It is a Duffinian number.

201 is strictly pandigital in base 4.

201 is a lucky number.

It is a plaindrome in base 12 and base 13.

It is a nialpdrome in base 3, base 6, base 8, base 15 and base 16.

It is not an unprimeable number, because it can be changed into a prime (211) 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, 31 + ... + 36.

It is an arithmetic number, because the mean of its divisors is an integer number (68).

It is an amenable number.

201 is a deficient number, since it is larger than the sum of its proper divisors (71).

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

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

The sum of its prime factors is 70.

The product of its (nonzero) digits is 2, while the sum is 3.

The square root of 201 is about 14.1774468788. The cubic root of 201 is about 5.8577660027.

The spelling of 201 in words is "two hundred one", and thus it is an aban number and an iban number.

Divisors: 1 3 67 201