• 241 can be written using four 4's:

241 has 2 divisors, whose sum is σ = 242. Its totient is φ = 240.

The previous prime is 239. The next prime is 251. The reversal of 241 is 142.

241 is nontrivially palindromic in base 12 and base 15.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225 + 16 = 15^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 241 - 2^{1} = 239 is a prime.

Together with 239, it forms a pair of twin primes.

It is an Ulam number.

It is the 16-th Hogben number.

241 is an undulating number in base 12.

241 is a lucky number.

241 is a nontrivial repdigit in base 15.

It is a plaindrome in base 11, base 13, base 14 and base 15.

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

It is a zygodrome in base 15.

It is not a weakly prime, because it can be changed into another prime (211) by changing a digit.

It is a nontrivial repunit in base 15.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120 + 121.

It is an arithmetic number, because the mean of its divisors is an integer number (121).

It is a Proth number, since it is equal to 15 ⋅ 2^{4} + 1 and 15 < 2^{4}.

It is an amenable number.

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

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

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

The product of its digits is 8, while the sum is 7.

The square root of 241 is about 15.5241746963. The cubic root of 241 is about 6.2230842532.

Adding to 241 its reverse (142), we get a palindrome (383).

Subtracting from 241 its reverse (142), we obtain a palindrome (99).

It can be divided in two parts, 24 and 1, that added together give a square (25 = 5^{2}).

The spelling of 241 in words is "two hundred forty-one", and thus it is an aban number and an iban number.

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