4851809 has 2 divisors, whose sum is σ = 4851810. Its totient is φ = 4851808.

The previous prime is 4851797. The next prime is 4851829. The reversal of 4851809 is 9081584.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3478225 + 1373584 = 1865^2 + 1172^2 .

It is a cyclic number.

It is not a de Polignac number, because 4851809 - 2⁴ = 4851793 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4851829) 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, 2425904 + 2425905.

It is an arithmetic number, because the mean of its divisors is an integer number (2425905).

Almost surely, 2^4851809 is an apocalyptic number.

It is an amenable number.

4851809 is a deficient number, since it is larger than the sum of its proper divisors (1).

4851809 is an equidigital number, since it uses as much as digits as its factorization.

4851809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 4851809 is about 2202.6822285568. The cubic root of 4851809 is about 169.2912708712.

The spelling of 4851809 in words is "four million, eight hundred fifty-one thousand, eight hundred nine".