5217809 has 2 divisors, whose sum is σ = 5217810. Its totient is φ = 5217808.

The previous prime is 5217787. The next prime is 5217841. The reversal of 5217809 is 9087125.

It is an a-pointer prime, because the next prime (5217841) can be obtained adding 5217809 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3717184 + 1500625 = 1928^2 + 1225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5217809 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 (5217859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2608904 + 2608905.

It is an arithmetic number, because the mean of its divisors is an integer number (2608905).

Almost surely, 2^5217809 is an apocalyptic number.

It is an amenable number.

5217809 is a deficient number, since it is larger than the sum of its proper divisors (1).

5217809 is an equidigital number, since it uses as much as digits as its factorization.

5217809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 5217809 is about 2284.2523941106. The cubic root of 5217809 is about 173.4453758672.

The spelling of 5217809 in words is "five million, two hundred seventeen thousand, eight hundred nine".