419208509 has 2 divisors, whose sum is σ = 419208510. Its totient is φ = 419208508.

The previous prime is 419208497. The next prime is 419208539. The reversal of 419208509 is 905802914.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 418202500 + 1006009 = 20450^2 + 1003^2 .

It is a cyclic number.

It is not a de Polignac number, because 419208509 - 2²⁰ = 418159933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (419208539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209604254 + 209604255.

It is an arithmetic number, because the mean of its divisors is an integer number (209604255).

Almost surely, 2^419208509 is an apocalyptic number.

It is an amenable number.

419208509 is a deficient number, since it is larger than the sum of its proper divisors (1).

419208509 is an equidigital number, since it uses as much as digits as its factorization.

419208509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 419208509 is about 20474.5820225957. The cubic root of 419208509 is about 748.4165163106.

The spelling of 419208509 in words is "four hundred nineteen million, two hundred eight thousand, five hundred nine".