5271809 has 4 divisors (see below), whose sum is σ = 5295060. Its totient is φ = 5248560.

The previous prime is 5271793. The next prime is 5271811. The reversal of 5271809 is 9081725.

5271809 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2900209 + 2371600 = 1703^2 + 1540^2 .

It is a cyclic number.

It is not a de Polignac number, because 5271809 - 2⁴ = 5271793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5271839) 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 in 3 ways as a sum of consecutive naturals, for example, 11282 + ... + 11739.

It is an arithmetic number, because the mean of its divisors is an integer number (1323765).

Almost surely, 2^5271809 is an apocalyptic number.

It is an amenable number.

5271809 is a deficient number, since it is larger than the sum of its proper divisors (23251).

5271809 is a wasteful number, since it uses less digits than its factorization.

5271809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23250.

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

The square root of 5271809 is about 2296.0420292320. The cubic root of 5271809 is about 174.0416621953.

The spelling of 5271809 in words is "five million, two hundred seventy-one thousand, eight hundred nine".