630221 has 4 divisors (see below), whose sum is σ = 647292. Its totient is φ = 613152.

The previous prime is 630197. The next prime is 630229. The reversal of 630221 is 122036.

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 366025 + 264196 = 605^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 630221 - 2¹⁸ = 368077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 630196 and 630205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8480 + ... + 8553.

It is an arithmetic number, because the mean of its divisors is an integer number (161823).

2⁶³⁰²²¹ is an apocalyptic number.

It is an amenable number.

630221 is a deficient number, since it is larger than the sum of its proper divisors (17071).

630221 is a wasteful number, since it uses less digits than its factorization.

630221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17070.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 630221 is about 793.8645980266. The cubic root of 630221 is about 85.7362117188.

Adding to 630221 its reverse (122036), we get a palindrome (752257).

The spelling of 630221 in words is "six hundred thirty thousand, two hundred twenty-one".