634809609 has 32 divisors (see below), whose sum is σ = 1077431040. Its totient is φ = 361863936.

The previous prime is 634809607. The next prime is 634809611. The reversal of 634809609 is 906908436.

634809609 is a `hidden beast` number, since 6 + 34 + 8 + 0 + 9 + 609 = 666.

634809609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (634809607) and next prime (634809611).

It is not a de Polignac number, because 634809609 - 2¹ = 634809607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (634809607) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77959 + ... + 85715.

It is an arithmetic number, because the mean of its divisors is an integer number (33669720).

Almost surely, 2^634809609 is an apocalyptic number.

It is an amenable number.

634809609 is a deficient number, since it is larger than the sum of its proper divisors (442621431).

634809609 is a wasteful number, since it uses less digits than its factorization.

634809609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8206 (or 8200 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 634809609 is about 25195.4283353151. The cubic root of 634809609 is about 859.4378916468.

The spelling of 634809609 in words is "six hundred thirty-four million, eight hundred nine thousand, six hundred nine".