41081981 has 2 divisors, whose sum is σ = 41081982. Its totient is φ = 41081980.

The previous prime is 41081969. The next prime is 41082017. The reversal of 41081981 is 18918014.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30415225 + 10666756 = 5515^2 + 3266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-41081981 is a prime.

It is a super-2 number, since 2×41081981² = 3375458325768722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41081281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20540990 + 20540991.

It is an arithmetic number, because the mean of its divisors is an integer number (20540991).

Almost surely, 2^41081981 is an apocalyptic number.

It is an amenable number.

41081981 is a deficient number, since it is larger than the sum of its proper divisors (1).

41081981 is an equidigital number, since it uses as much as digits as its factorization.

41081981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 41081981 is about 6409.5226811362. The cubic root of 41081981 is about 345.0513989093.

Adding to 41081981 its reverse (18918014), we get a palindrome (59999995).

The spelling of 41081981 in words is "forty-one million, eighty-one thousand, nine hundred eighty-one".