809109419 has 2 divisors, whose sum is σ = 809109420. Its totient is φ = 809109418.

The previous prime is 809109403. The next prime is 809109439. The reversal of 809109419 is 914901908.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 809109419 - 2⁴ = 809109403 is a prime.

It is a super-2 number, since 2×809109419² = 1309316103829035122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (809109439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404554709 + 404554710.

It is an arithmetic number, because the mean of its divisors is an integer number (404554710).

Almost surely, 2^809109419 is an apocalyptic number.

809109419 is a deficient number, since it is larger than the sum of its proper divisors (1).

809109419 is an equidigital number, since it uses as much as digits as its factorization.

809109419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 809109419 is about 28444.8487252086. The cubic root of 809109419 is about 931.8279916589.

The spelling of 809109419 in words is "eight hundred nine million, one hundred nine thousand, four hundred nineteen".