634502409 has 4 divisors (see below), whose sum is σ = 846003216. Its totient is φ = 423001604.

The previous prime is 634502399. The next prime is 634502423. The reversal of 634502409 is 904205436.

634502409 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 a cyclic number.

It is not a de Polignac number, because 634502409 - 2⁵ = 634502377 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 634502409.

It is not an unprimeable number, because it can be changed into a prime (634502459) 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, 105750399 + ... + 105750404.

It is an arithmetic number, because the mean of its divisors is an integer number (211500804).

Almost surely, 2^634502409 is an apocalyptic number.

It is an amenable number.

634502409 is a deficient number, since it is larger than the sum of its proper divisors (211500807).

634502409 is a wasteful number, since it uses less digits than its factorization.

634502409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211500806.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 634502409 is about 25189.3312535287. The cubic root of 634502409 is about 859.2992348923.

The spelling of 634502409 in words is "six hundred thirty-four million, five hundred two thousand, four hundred nine".