630642009 has 4 divisors (see below), whose sum is σ = 840856016. Its totient is φ = 420428004.

The previous prime is 630641983. The next prime is 630642041. The reversal of 630642009 is 900246036.

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 not a de Polignac number, because 630642009 - 2¹⁹ = 630117721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630642059) 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, 105106999 + ... + 105107004.

It is an arithmetic number, because the mean of its divisors is an integer number (210214004).

Almost surely, 2^630642009 is an apocalyptic number.

It is an amenable number.

630642009 is a deficient number, since it is larger than the sum of its proper divisors (210214007).

630642009 is a wasteful number, since it uses less digits than its factorization.

630642009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210214006.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 630642009 is about 25112.5866648579. The cubic root of 630642009 is about 857.5529903476.

The spelling of 630642009 in words is "six hundred thirty million, six hundred forty-two thousand, nine".