634670321 has 4 divisors (see below), whose sum is σ = 641213412. Its totient is φ = 628127232.

The previous prime is 634670269. The next prime is 634670339. The reversal of 634670321 is 123076436.

634670321 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.

It can be written as a sum of positive squares in 2 ways, for example, as 404814400 + 229855921 = 20120^2 + 15161^2 .

It is a cyclic number.

It is not a de Polignac number, because 634670321 - 2¹⁰ = 634669297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634672321) 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, 3271400 + ... + 3271593.

It is an arithmetic number, because the mean of its divisors is an integer number (160303353).

Almost surely, 2^634670321 is an apocalyptic number.

It is an amenable number.

634670321 is a deficient number, since it is larger than the sum of its proper divisors (6543091).

634670321 is an equidigital number, since it uses as much as digits as its factorization.

634670321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6543090.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 634670321 is about 25192.6640314199. The cubic root of 634670321 is about 859.3750286299.

It can be divided in two parts, 6346 and 70321, that added together give a palindrome (76667).

The spelling of 634670321 in words is "six hundred thirty-four million, six hundred seventy thousand, three hundred twenty-one".