505340013 has 4 divisors (see below), whose sum is σ = 673786688. Its totient is φ = 336893340.

The previous prime is 505340009. The next prime is 505340039. The reversal of 505340013 is 310043505.

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 not a de Polignac number, because 505340013 - 2² = 505340009 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 (505340713) 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, 84223333 + ... + 84223338.

It is an arithmetic number, because the mean of its divisors is an integer number (168446672).

Almost surely, 2^505340013 is an apocalyptic number.

It is an amenable number.

505340013 is a deficient number, since it is larger than the sum of its proper divisors (168446675).

505340013 is a wasteful number, since it uses less digits than its factorization.

505340013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168446674.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 505340013 is about 22479.7689712328. The cubic root of 505340013 is about 796.5161069058.

Adding to 505340013 its reverse (310043505), we get a palindrome (815383518).

The spelling of 505340013 in words is "five hundred five million, three hundred forty thousand, thirteen".