630455021 has 12 divisors (see below), whose sum is σ = 740246688. Its totient is φ = 535335192.

The previous prime is 630454999. The next prime is 630455071. The reversal of 630455021 is 120554036.

It is not a de Polignac number, because 630455021 - 2¹⁸ = 630192877 is a prime.

It is a super-2 number, since 2×630455021² = 794947067008220882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630455071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54881 + ... + 65366.

It is an arithmetic number, because the mean of its divisors is an integer number (61687224).

Almost surely, 2^630455021 is an apocalyptic number.

It is an amenable number.

630455021 is a deficient number, since it is larger than the sum of its proper divisors (109791667).

630455021 is a wasteful number, since it uses less digits than its factorization.

630455021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120368 (or 120361 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 630455021 is about 25108.8633952236. The cubic root of 630455021 is about 857.4682259502.

The spelling of 630455021 in words is "six hundred thirty million, four hundred fifty-five thousand, twenty-one".