630291 has 4 divisors (see below), whose sum is σ = 840392. Its totient is φ = 420192.

The previous prime is 630281. The next prime is 630299. The reversal of 630291 is 192036.

630291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 630291 - 2⁷ = 630163 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (630299) 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, 105046 + ... + 105051.

It is an arithmetic number, because the mean of its divisors is an integer number (210098).

2⁶³⁰²⁹¹ is an apocalyptic number.

630291 is a deficient number, since it is larger than the sum of its proper divisors (210101).

630291 is a wasteful number, since it uses less digits than its factorization.

630291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210100.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 630291 is about 793.9086849254. The cubic root of 630291 is about 85.7393859030.

The spelling of 630291 in words is "six hundred thirty thousand, two hundred ninety-one".