630999 has 6 divisors (see below), whose sum is σ = 911456. Its totient is φ = 420660.

The previous prime is 630997. The next prime is 631003. The reversal of 630999 is 999036.

630999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 630999 - 2¹ = 630997 is a prime.

It is a Duffinian number.

630999 is a modest number, since divided by 999 gives 630 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630997) 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, 35047 + ... + 35064.

2⁶³⁰⁹⁹⁹ is an apocalyptic number.

630999 is a deficient number, since it is larger than the sum of its proper divisors (280457).

630999 is a wasteful number, since it uses less digits than its factorization.

630999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70117 (or 70114 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 630999 is about 794.3544548877. The cubic root of 630999 is about 85.7714773075.

The spelling of 630999 in words is "six hundred thirty thousand, nine hundred ninety-nine".