42841009 has 2 divisors, whose sum is σ = 42841010. Its totient is φ = 42841008.

The previous prime is 42840997. The next prime is 42841027. The reversal of 42841009 is 90014824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22591009 + 20250000 = 4753^2 + 4500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42841009 is a prime.

It is not a weakly prime, because it can be changed into another prime (42841049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21420504 + 21420505.

It is an arithmetic number, because the mean of its divisors is an integer number (21420505).

Almost surely, 2^42841009 is an apocalyptic number.

It is an amenable number.

42841009 is a deficient number, since it is larger than the sum of its proper divisors (1).

42841009 is an equidigital number, since it uses as much as digits as its factorization.

42841009 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 28.

The square root of 42841009 is about 6545.3043473929. The cubic root of 42841009 is about 349.9074830297.

The spelling of 42841009 in words is "forty-two million, eight hundred forty-one thousand, nine".