503421605 has 4 divisors (see below), whose sum is σ = 604105932. Its totient is φ = 402737280.

The previous prime is 503421563. The next prime is 503421619. The reversal of 503421605 is 506124305.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506124305 = 5 ⋅101224861.

It can be written as a sum of positive squares in 2 ways, for example, as 93683041 + 409738564 = 9679^2 + 20242^2 .

It is not a de Polignac number, because 503421605 - 2¹⁰ = 503420581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50342156 + ... + 50342165.

It is an arithmetic number, because the mean of its divisors is an integer number (151026483).

Almost surely, 2^503421605 is an apocalyptic number.

It is an amenable number.

503421605 is a deficient number, since it is larger than the sum of its proper divisors (100684327).

503421605 is a wasteful number, since it uses less digits than its factorization.

503421605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100684326.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 503421605 is about 22437.0587421792. The cubic root of 503421605 is about 795.5068982261.

The spelling of 503421605 in words is "five hundred three million, four hundred twenty-one thousand, six hundred five".