504331721 has 6 divisors (see below), whose sum is σ = 522323022. Its totient is φ = 486940160.

The previous prime is 504331717. The next prime is 504331747. The reversal of 504331721 is 127133405.

It can be written as a sum of positive squares in 3 ways, for example, as 83466496 + 420865225 = 9136^2 + 20515^2 .

It is not a de Polignac number, because 504331721 - 2² = 504331717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (504331921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 299000 + ... + 300681.

It is an arithmetic number, because the mean of its divisors is an integer number (87053837).

Almost surely, 2^504331721 is an apocalyptic number.

It is an amenable number.

504331721 is a deficient number, since it is larger than the sum of its proper divisors (17991301).

504331721 is an equidigital number, since it uses as much as digits as its factorization.

504331721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599739 (or 599710 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 504331721 is about 22457.3311192581. The cubic root of 504331721 is about 795.9859981081.

The spelling of 504331721 in words is "five hundred four million, three hundred thirty-one thousand, seven hundred twenty-one".