630831 has 4 divisors (see below), whose sum is σ = 841112. Its totient is φ = 420552.

The previous prime is 630827. The next prime is 630841. The reversal of 630831 is 138036.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 630831 - 2² = 630827 is a prime.

It is a super-3 number, since 3×630831³ = 753113332302438573, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 630798 and 630807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630841) 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, 105136 + ... + 105141.

It is an arithmetic number, because the mean of its divisors is an integer number (210278).

2⁶³⁰⁸³¹ is an apocalyptic number.

630831 is a deficient number, since it is larger than the sum of its proper divisors (210281).

630831 is a wasteful number, since it uses less digits than its factorization.

630831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210280.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 630831 is about 794.2487016042. The cubic root of 630831 is about 85.7638645710.

Adding to 630831 its reverse (138036), we get a palindrome (768867).

The spelling of 630831 in words is "six hundred thirty thousand, eight hundred thirty-one".