630640213 has 4 divisors (see below), whose sum is σ = 720731680. Its totient is φ = 540548748.

The previous prime is 630640201. The next prime is 630640237. The reversal of 630640213 is 312046036.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 630640213 - 2²⁹ = 93769301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630640253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45045723 + ... + 45045736.

It is an arithmetic number, because the mean of its divisors is an integer number (180182920).

Almost surely, 2^630640213 is an apocalyptic number.

It is an amenable number.

630640213 is a deficient number, since it is larger than the sum of its proper divisors (90091467).

630640213 is an equidigital number, since it uses as much as digits as its factorization.

630640213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90091466.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 630640213 is about 25112.5509058717. The cubic root of 630640213 is about 857.5521762742.

Adding to 630640213 its reverse (312046036), we get a palindrome (942686249).

The spelling of 630640213 in words is "six hundred thirty million, six hundred forty thousand, two hundred thirteen".