634641163 has 4 divisors (see below), whose sum is σ = 683459728. Its totient is φ = 585822600.

The previous prime is 634641151. The next prime is 634641167. The reversal of 634641163 is 361146436.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634641163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634641167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24409263 + ... + 24409288.

It is an arithmetic number, because the mean of its divisors is an integer number (170864932).

Almost surely, 2^634641163 is an apocalyptic number.

634641163 is a deficient number, since it is larger than the sum of its proper divisors (48818565).

634641163 is a wasteful number, since it uses less digits than its factorization.

634641163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48818564.

The product of its digits is 31104, while the sum is 34.

The square root of 634641163 is about 25192.0853245618. The cubic root of 634641163 is about 859.3618679699.

Adding to 634641163 its reverse (361146436), we get a palindrome (995787599).

The spelling of 634641163 in words is "six hundred thirty-four million, six hundred forty-one thousand, one hundred sixty-three".