634501221 has 4 divisors (see below), whose sum is σ = 846001632. Its totient is φ = 423000812.

The previous prime is 634501157. The next prime is 634501229. The reversal of 634501221 is 122105436.

634501221 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 634501221 - 2⁶ = 634501157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 634501191 and 634501200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634501229) 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, 105750201 + ... + 105750206.

It is an arithmetic number, because the mean of its divisors is an integer number (211500408).

Almost surely, 2^634501221 is an apocalyptic number.

It is an amenable number.

634501221 is a deficient number, since it is larger than the sum of its proper divisors (211500411).

634501221 is a wasteful number, since it uses less digits than its factorization.

634501221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211500410.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 634501221 is about 25189.3076721056. The cubic root of 634501221 is about 859.2986985938.

Adding to 634501221 its reverse (122105436), we get a palindrome (756606657).

The spelling of 634501221 in words is "six hundred thirty-four million, five hundred one thousand, two hundred twenty-one".