4809509 has 2 divisors, whose sum is σ = 4809510. Its totient is φ = 4809508.

The previous prime is 4809479. The next prime is 4809547. The reversal of 4809509 is 9059084.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3621409 + 1188100 = 1903^2 + 1090^2 .

It is a cyclic number.

It is not a de Polignac number, because 4809509 - 2⁸ = 4809253 is a prime.

It is a super-3 number, since 3×4809509³ (a number of 21 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4809559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2404754 + 2404755.

It is an arithmetic number, because the mean of its divisors is an integer number (2404755).

Almost surely, 2^4809509 is an apocalyptic number.

It is an amenable number.

4809509 is a deficient number, since it is larger than the sum of its proper divisors (1).

4809509 is an equidigital number, since it uses as much as digits as its factorization.

4809509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 4809509 is about 2193.0592787246. The cubic root of 4809509 is about 168.7978512675.

The spelling of 4809509 in words is "four million, eight hundred nine thousand, five hundred nine".