530721 has 12 divisors (see below), whose sum is σ = 775060. Its totient is φ = 349920.

The previous prime is 530713. The next prime is 530731. The reversal of 530721 is 127035.

It can be written as a sum of positive squares in 2 ways, for example, as 291600 + 239121 = 540^2 + 489^2 .

It is not a de Polignac number, because 530721 - 2³ = 530713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 530694 and 530703.

It is not an unprimeable number, because it can be changed into a prime (530701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 711 + ... + 1251.

2⁵³⁰⁷²¹ is an apocalyptic number.

It is an amenable number.

530721 is a deficient number, since it is larger than the sum of its proper divisors (244339).

530721 is a wasteful number, since it uses less digits than its factorization.

530721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 530721 is about 728.5060054660. The cubic root of 530721 is about 80.9634036784.

Adding to 530721 its reverse (127035), we get a palindrome (657756).

The spelling of 530721 in words is "five hundred thirty thousand, seven hundred twenty-one".