630581 has 12 divisors (see below), whose sum is σ = 777708. Its totient is φ = 508032.

The previous prime is 630577. The next prime is 630583. The reversal of 630581 is 185036.

It can be written as a sum of positive squares in 2 ways, for example, as 442225 + 188356 = 665^2 + 434^2 .

It is not a de Polignac number, because 630581 - 2² = 630577 is a prime.

It is a super-2 number, since 2×630581² = 795264795122, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 630581.

It is not an unprimeable number, because it can be changed into a prime (630583) 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, 455 + ... + 1211.

It is an arithmetic number, because the mean of its divisors is an integer number (64809).

2⁶³⁰⁵⁸¹ is an apocalyptic number.

It is an amenable number.

630581 is a deficient number, since it is larger than the sum of its proper divisors (147127).

630581 is a wasteful number, since it uses less digits than its factorization.

630581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 630581 is about 794.0913045740. The cubic root of 630581 is about 85.7525335917.

The spelling of 630581 in words is "six hundred thirty thousand, five hundred eighty-one".