630416621 has 2 divisors, whose sum is σ = 630416622. Its totient is φ = 630416620.

The previous prime is 630416617. The next prime is 630416659. The reversal of 630416621 is 126614036.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 502387396 + 128029225 = 22414^2 + 11315^2 .

It is a cyclic number.

It is not a de Polignac number, because 630416621 - 2² = 630416617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (630416221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315208310 + 315208311.

It is an arithmetic number, because the mean of its divisors is an integer number (315208311).

Almost surely, 2^630416621 is an apocalyptic number.

It is an amenable number.

630416621 is a deficient number, since it is larger than the sum of its proper divisors (1).

630416621 is an equidigital number, since it uses as much as digits as its factorization.

630416621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 630416621 is about 25108.0987133634. The cubic root of 630416621 is about 857.4508165939.

The spelling of 630416621 in words is "six hundred thirty million, four hundred sixteen thousand, six hundred twenty-one".