634509 has 6 divisors (see below), whose sum is σ = 916526. Its totient is φ = 423000.

The previous prime is 634499. The next prime is 634511. The reversal of 634509 is 905436.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 585225 + 49284 = 765^2 + 222^2 .

It is not a de Polignac number, because 634509 - 2⁴ = 634493 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35242 + ... + 35259.

2⁶³⁴⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

634509 is a deficient number, since it is larger than the sum of its proper divisors (282017).

634509 is a wasteful number, since it uses less digits than its factorization.

634509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70507 (or 70504 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 634509 is about 796.5607321479. The cubic root of 634509 is about 85.9302210254.

The spelling of 634509 in words is "six hundred thirty-four thousand, five hundred nine".