505021513 has 4 divisors (see below), whose sum is σ = 510021828. Its totient is φ = 500021200.

The previous prime is 505021507. The next prime is 505021529. The reversal of 505021513 is 315120505.

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 493372944 + 11648569 = 22212^2 + 3413^2 .

It is a cyclic number.

It is not a de Polignac number, because 505021513 - 2⁹ = 505021001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505021553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2500006 + ... + 2500207.

It is an arithmetic number, because the mean of its divisors is an integer number (127505457).

Almost surely, 2^505021513 is an apocalyptic number.

It is an amenable number.

505021513 is a deficient number, since it is larger than the sum of its proper divisors (5000315).

505021513 is a wasteful number, since it uses less digits than its factorization.

505021513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000314.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 505021513 is about 22472.6837071143. The cubic root of 505021513 is about 796.3487320098.

The spelling of 505021513 in words is "five hundred five million, twenty-one thousand, five hundred thirteen".