630381891 has 8 divisors (see below), whose sum is σ = 842671440. Its totient is φ = 419173472.

The previous prime is 630381889. The next prime is 630381959. The reversal of 630381891 is 198183036.

630381891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 630381891 - 2¹ = 630381889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (630381821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268920 + ... + 271253.

It is an arithmetic number, because the mean of its divisors is an integer number (105333930).

Almost surely, 2^630381891 is an apocalyptic number.

630381891 is a deficient number, since it is larger than the sum of its proper divisors (212289549).

630381891 is a wasteful number, since it uses less digits than its factorization.

630381891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540565.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 630381891 is about 25107.4070943218. The cubic root of 630381891 is about 857.4350704916.

The spelling of 630381891 in words is "six hundred thirty million, three hundred eighty-one thousand, eight hundred ninety-one".