41981 has 2 divisors, whose sum is σ = 41982. Its totient is φ = 41980.

The previous prime is 41969. The next prime is 41983. The reversal of 41981 is 18914.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24025 + 17956 = 155^2 + 134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-41981 is a prime.

It is a super-2 number, since 2×41981² = 3524808722, which contains 22 as substring.

Together with 41983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41983) 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, 20990 + 20991.

It is an arithmetic number, because the mean of its divisors is an integer number (20991).

2⁴¹⁹⁸¹ is an apocalyptic number.

It is an amenable number.

41981 is a deficient number, since it is larger than the sum of its proper divisors (1).

41981 is an equidigital number, since it uses as much as digits as its factorization.

41981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 23.

The square root of 41981 is about 204.8926548220. The cubic root of 41981 is about 34.7550240308.

The spelling of 41981 in words is "forty-one thousand, nine hundred eighty-one".