503953021 has 12 divisors (see below), whose sum is σ = 596543836. Its totient is φ = 422896320.

The previous prime is 503953013. The next prime is 503953057. The reversal of 503953021 is 120359305.

It can be written as a sum of positive squares in 2 ways, for example, as 174530521 + 329422500 = 13211^2 + 18150^2 .

It is not a de Polignac number, because 503953021 - 2³ = 503953013 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (503953921) 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 11 ways as a sum of consecutive naturals, for example, 158616 + ... + 161761.

Almost surely, 2^503953021 is an apocalyptic number.

It is an amenable number.

503953021 is a deficient number, since it is larger than the sum of its proper divisors (92590815).

503953021 is a wasteful number, since it uses less digits than its factorization.

503953021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320412 (or 320401 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 503953021 is about 22448.8979907701. The cubic root of 503953021 is about 795.7867143389.

The spelling of 503953021 in words is "five hundred three million, nine hundred fifty-three thousand, twenty-one".