630491 has 4 divisors (see below), whose sum is σ = 633984. Its totient is φ = 627000.

The previous prime is 630481. The next prime is 630493. The reversal of 630491 is 194036.

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

It is a cyclic number.

It is not a de Polignac number, because 630491 - 2¹⁰ = 629467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1460 + ... + 1841.

It is an arithmetic number, because the mean of its divisors is an integer number (158496).

2⁶³⁰⁴⁹¹ is an apocalyptic number.

630491 is a deficient number, since it is larger than the sum of its proper divisors (3493).

630491 is a wasteful number, since it uses less digits than its factorization.

630491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3492.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 630491 is about 794.0346340053. The cubic root of 630491 is about 85.7484537060.

The spelling of 630491 in words is "six hundred thirty thousand, four hundred ninety-one".