630868021 has 4 divisors (see below), whose sum is σ = 720992032. Its totient is φ = 540744012.

The previous prime is 630868013. The next prime is 630868027. The reversal of 630868021 is 120868036.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 630868021 - 2³ = 630868013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630868027) 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, 45061995 + ... + 45062008.

It is an arithmetic number, because the mean of its divisors is an integer number (180248008).

Almost surely, 2^630868021 is an apocalyptic number.

It is an amenable number.

630868021 is a deficient number, since it is larger than the sum of its proper divisors (90124011).

630868021 is an equidigital number, since it uses as much as digits as its factorization.

630868021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90124010.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 630868021 is about 25117.0862362655. The cubic root of 630868021 is about 857.6554225329.

The spelling of 630868021 in words is "six hundred thirty million, eight hundred sixty-eight thousand, twenty-one".