634504809 has 4 divisors (see below), whose sum is σ = 846006416. Its totient is φ = 423003204.

The previous prime is 634504789. The next prime is 634504847. The reversal of 634504809 is 908405436.

634504809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 634504809 - 2⁷ = 634504681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (634504709) 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, 105750799 + ... + 105750804.

It is an arithmetic number, because the mean of its divisors is an integer number (211501604).

Almost surely, 2^634504809 is an apocalyptic number.

It is an amenable number.

634504809 is a deficient number, since it is larger than the sum of its proper divisors (211501607).

634504809 is a wasteful number, since it uses less digits than its factorization.

634504809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211501606.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 634504809 is about 25189.3788927000. The cubic root of 634504809 is about 859.3003183216.

The spelling of 634504809 in words is "six hundred thirty-four million, five hundred four thousand, eight hundred nine".