505015909 has 4 divisors (see below), whose sum is σ = 505119904. Its totient is φ = 504911916.

The previous prime is 505015859. The next prime is 505015933. The reversal of 505015909 is 909510505.

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 505015909 - 2⁷ = 505015781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505015969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44337 + ... + 54550.

It is an arithmetic number, because the mean of its divisors is an integer number (126279976).

Almost surely, 2^505015909 is an apocalyptic number.

It is an amenable number.

505015909 is a deficient number, since it is larger than the sum of its proper divisors (103995).

505015909 is an equidigital number, since it uses as much as digits as its factorization.

505015909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103994.

The product of its (nonzero) digits is 10125, while the sum is 34.

The square root of 505015909 is about 22472.5590220607. The cubic root of 505015909 is about 796.3457864225.

The spelling of 505015909 in words is "five hundred five million, fifteen thousand, nine hundred nine".