500820809 has 4 divisors (see below), whose sum is σ = 503819904. Its totient is φ = 497821716.

The previous prime is 500820787. The next prime is 500820839. The reversal of 500820809 is 908028005.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 500820809 - 2¹² = 500816713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (500820839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1499297 + ... + 1499630.

It is an arithmetic number, because the mean of its divisors is an integer number (125954976).

Almost surely, 2^500820809 is an apocalyptic number.

It is an amenable number.

500820809 is a deficient number, since it is larger than the sum of its proper divisors (2999095).

500820809 is a wasteful number, since it uses less digits than its factorization.

500820809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2999094.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 500820809 is about 22379.0260958783. The cubic root of 500820809 is about 794.1346062294.

The spelling of 500820809 in words is "five hundred million, eight hundred twenty thousand, eight hundred nine".