409018409 has 2 divisors, whose sum is σ = 409018410. Its totient is φ = 409018408.

The previous prime is 409018391. The next prime is 409018447. The reversal of 409018409 is 904810904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 322992784 + 86025625 = 17972^2 + 9275^2 .

It is a cyclic number.

It is not a de Polignac number, because 409018409 - 2⁸ = 409018153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (409018109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204509204 + 204509205.

It is an arithmetic number, because the mean of its divisors is an integer number (204509205).

Almost surely, 2^409018409 is an apocalyptic number.

It is an amenable number.

409018409 is a deficient number, since it is larger than the sum of its proper divisors (1).

409018409 is an equidigital number, since it uses as much as digits as its factorization.

409018409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 409018409 is about 20224.2035442684. The cubic root of 409018409 is about 742.3025486676.

The spelling of 409018409 in words is "four hundred nine million, eighteen thousand, four hundred nine".