41806561 has 2 divisors, whose sum is σ = 41806562. Its totient is φ = 41806560.

The previous prime is 41806549. The next prime is 41806573. The reversal of 41806561 is 16560814.

It is a balanced prime because it is at equal distance from previous prime (41806549) and next prime (41806573).

It can be written as a sum of positive squares in only one way, i.e., 40259025 + 1547536 = 6345^2 + 1244^2 .

It is a cyclic number.

It is not a de Polignac number, because 41806561 - 2⁵ = 41806529 is a prime.

It is not a weakly prime, because it can be changed into another prime (41806591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20903280 + 20903281.

It is an arithmetic number, because the mean of its divisors is an integer number (20903281).

Almost surely, 2^41806561 is an apocalyptic number.

It is an amenable number.

41806561 is a deficient number, since it is larger than the sum of its proper divisors (1).

41806561 is an equidigital number, since it uses as much as digits as its factorization.

41806561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 41806561 is about 6465.7993318692. The cubic root of 41806561 is about 347.0681930164.

The spelling of 41806561 in words is "forty-one million, eight hundred six thousand, five hundred sixty-one".