630584809 has 6 divisors (see below), whose sum is σ = 645592506. Its totient is φ = 615918240.

The previous prime is 630584777. The next prime is 630584881. The reversal of 630584809 is 908485036.

It can be written as a sum of positive squares in only one way, i.e., 469675584 + 160909225 = 21672^2 + 12685^2 .

It is not a de Polignac number, because 630584809 - 2⁵ = 630584777 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630587809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 168672 + ... + 172369.

It is an arithmetic number, because the mean of its divisors is an integer number (107598751).

Almost surely, 2^630584809 is an apocalyptic number.

It is an amenable number.

630584809 is a deficient number, since it is larger than the sum of its proper divisors (15007697).

630584809 is an equidigital number, since it uses as much as digits as its factorization.

630584809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341127 (or 341084 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 630584809 is about 25111.4477679006. The cubic root of 630584809 is about 857.5270625294.

The spelling of 630584809 in words is "six hundred thirty million, five hundred eighty-four thousand, eight hundred nine".