630565 has 16 divisors (see below), whose sum is σ = 831600. Its totient is φ = 456192.

The previous prime is 630559. The next prime is 630577. The reversal of 630565 is 565036.

630565 = 561² + 562².

It can be written as a sum of positive squares in 8 ways, for example, as 66564 + 564001 = 258^2 + 751^2 .

It is a 5-Lehmer number, since φ(630565) divides (630565-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 630565 - 2¹⁷ = 499493 is a prime.

It is a super-2 number, since 2×630565² = 795224438450, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5731 + ... + 5839.

It is an arithmetic number, because the mean of its divisors is an integer number (51975).

2⁶³⁰⁵⁶⁵ is an apocalyptic number.

630565 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

630565 is the 562-nd centered square number.

It is an amenable number.

630565 is a deficient number, since it is larger than the sum of its proper divisors (201035).

630565 is a wasteful number, since it uses less digits than its factorization.

630565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 630565 is about 794.0812301018. The cubic root of 630565 is about 85.7518083070.

The spelling of 630565 in words is "six hundred thirty thousand, five hundred sixty-five".