634333321 has 2 divisors, whose sum is σ = 634333322. Its totient is φ = 634333320.

The previous prime is 634333319. The next prime is 634333361. The reversal of 634333321 is 123333436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 485761600 + 148571721 = 22040^2 + 12189^2 .

It is a cyclic number.

It is not a de Polignac number, because 634333321 - 2¹ = 634333319 is a prime.

Together with 634333319, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 634333321.

It is not a weakly prime, because it can be changed into another prime (634333361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317166660 + 317166661.

It is an arithmetic number, because the mean of its divisors is an integer number (317166661).

Almost surely, 2^634333321 is an apocalyptic number.

It is an amenable number.

634333321 is a deficient number, since it is larger than the sum of its proper divisors (1).

634333321 is an equidigital number, since it uses as much as digits as its factorization.

634333321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 28.

The square root of 634333321 is about 25185.9746883062. The cubic root of 634333321 is about 859.2228968067. Note that the first 3 decimals are identical.

Adding to 634333321 its reverse (123333436), we get a palindrome (757666757).

The spelling of 634333321 in words is "six hundred thirty-four million, three hundred thirty-three thousand, three hundred twenty-one".