405016609 has 2 divisors, whose sum is σ = 405016610. Its totient is φ = 405016608.

The previous prime is 405016607. The next prime is 405016627. The reversal of 405016609 is 906610504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 337530384 + 67486225 = 18372^2 + 8215^2 .

It is a cyclic number.

It is not a de Polignac number, because 405016609 - 2¹ = 405016607 is a prime.

Together with 405016607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (405016607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202508304 + 202508305.

It is an arithmetic number, because the mean of its divisors is an integer number (202508305).

Almost surely, 2^405016609 is an apocalyptic number.

It is an amenable number.

405016609 is a deficient number, since it is larger than the sum of its proper divisors (1).

405016609 is an equidigital number, since it uses as much as digits as its factorization.

405016609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 405016609 is about 20125.0244471901. The cubic root of 405016609 is about 739.8737360662.

The spelling of 405016609 in words is "four hundred five million, sixteen thousand, six hundred nine".