630388217 has 2 divisors, whose sum is σ = 630388218. Its totient is φ = 630388216.

The previous prime is 630388153. The next prime is 630388229. The reversal of 630388217 is 712883036.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350026681 + 280361536 = 18709^2 + 16744^2 .

It is a cyclic number.

It is not a de Polignac number, because 630388217 - 2⁶ = 630388153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (630388247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315194108 + 315194109.

It is an arithmetic number, because the mean of its divisors is an integer number (315194109).

Almost surely, 2^630388217 is an apocalyptic number.

It is an amenable number.

630388217 is a deficient number, since it is larger than the sum of its proper divisors (1).

630388217 is an equidigital number, since it uses as much as digits as its factorization.

630388217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 630388217 is about 25107.5330727652. The cubic root of 630388217 is about 857.4379386557.

The spelling of 630388217 in words is "six hundred thirty million, three hundred eighty-eight thousand, two hundred seventeen".