41565809 has 2 divisors, whose sum is σ = 41565810. Its totient is φ = 41565808.

The previous prime is 41565803. The next prime is 41565829. The reversal of 41565809 is 90856514.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32171584 + 9394225 = 5672^2 + 3065^2 .

It is a cyclic number.

It is not a de Polignac number, because 41565809 - 2⁸ = 41565553 is a prime.

It is not a weakly prime, because it can be changed into another prime (41565803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20782904 + 20782905.

It is an arithmetic number, because the mean of its divisors is an integer number (20782905).

Almost surely, 2^41565809 is an apocalyptic number.

It is an amenable number.

41565809 is a deficient number, since it is larger than the sum of its proper divisors (1).

41565809 is an equidigital number, since it uses as much as digits as its factorization.

41565809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 41565809 is about 6447.1551090384. The cubic root of 41565809 is about 346.4006879723.

The spelling of 41565809 in words is "forty-one million, five hundred sixty-five thousand, eight hundred nine".