41805781 has 2 divisors, whose sum is σ = 41805782. Its totient is φ = 41805780.

The previous prime is 41805769. The next prime is 41805787. The reversal of 41805781 is 18750814.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40436881 + 1368900 = 6359^2 + 1170^2 .

It is a cyclic number.

It is not a de Polignac number, because 41805781 - 2⁵ = 41805749 is a prime.

It is a super-2 number, since 2×41805781² = 3495446650039922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41805787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20902890 + 20902891.

It is an arithmetic number, because the mean of its divisors is an integer number (20902891).

Almost surely, 2^41805781 is an apocalyptic number.

It is an amenable number.

41805781 is a deficient number, since it is larger than the sum of its proper divisors (1).

41805781 is an equidigital number, since it uses as much as digits as its factorization.

41805781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 41805781 is about 6465.7390142195. The cubic root of 41805781 is about 347.0660345444.

The spelling of 41805781 in words is "forty-one million, eight hundred five thousand, seven hundred eighty-one".