241981 has 2 divisors, whose sum is σ = 241982. Its totient is φ = 241980.

The previous prime is 241979. The next prime is 241993. The reversal of 241981 is 189142.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241081 + 900 = 491^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 241981 - 2¹ = 241979 is a prime.

It is a super-2 number, since 2×241981² = 117109608722, which contains 22 as substring.

Together with 241979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (241921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120990 + 120991.

It is an arithmetic number, because the mean of its divisors is an integer number (120991).

2²⁴¹⁹⁸¹ is an apocalyptic number.

It is an amenable number.

241981 is a deficient number, since it is larger than the sum of its proper divisors (1).

241981 is an equidigital number, since it uses as much as digits as its factorization.

241981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

The square root of 241981 is about 491.9156431747. The cubic root of 241981 is about 62.3151659207.

It can be divided in two parts, 2419 and 81, that added together give a square (2500 = 50²).

The spelling of 241981 in words is "two hundred forty-one thousand, nine hundred eighty-one".