630989021 has 16 divisors (see below), whose sum is σ = 688431744. Its totient is φ = 574858944.

The previous prime is 630988997. The next prime is 630989033. The reversal of 630989021 is 120989036.

It is a cyclic number.

It is not a de Polignac number, because 630989021 - 2¹⁴ = 630972637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630989071) 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, 530990 + ... + 532176.

It is an arithmetic number, because the mean of its divisors is an integer number (43026984).

Almost surely, 2^630989021 is an apocalyptic number.

It is an amenable number.

630989021 is a deficient number, since it is larger than the sum of its proper divisors (57442723).

630989021 is a wasteful number, since it uses less digits than its factorization.

630989021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 630989021 is about 25119.4948396659. The cubic root of 630989021 is about 857.7102515773.

The spelling of 630989021 in words is "six hundred thirty million, nine hundred eighty-nine thousand, twenty-one".