630651 has 16 divisors (see below), whose sum is σ = 979200. Its totient is φ = 353568.

The previous prime is 630613. The next prime is 630659. The reversal of 630651 is 156036.

It is not a de Polignac number, because 630651 - 2⁶ = 630587 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (630659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 985 + ... + 1493.

It is an arithmetic number, because the mean of its divisors is an integer number (61200).

2⁶³⁰⁶⁵¹ is an apocalyptic number.

630651 is a deficient number, since it is larger than the sum of its proper divisors (348549).

630651 is a wasteful number, since it uses less digits than its factorization.

630651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 630651 is about 794.1353788870. The cubic root of 630651 is about 85.7557065677.

Adding to 630651 its reverse (156036), we get a palindrome (786687).

The spelling of 630651 in words is "six hundred thirty thousand, six hundred fifty-one".