634688443 has 2 divisors, whose sum is σ = 634688444. Its totient is φ = 634688442.

The previous prime is 634688437. The next prime is 634688477. The reversal of 634688443 is 344886436.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634688443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 634688393 and 634688402.

It is not a weakly prime, because it can be changed into another prime (634688543) 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 as a sum of consecutive naturals, namely, 317344221 + 317344222.

It is an arithmetic number, because the mean of its divisors is an integer number (317344222).

Almost surely, 2^634688443 is an apocalyptic number.

634688443 is a deficient number, since it is larger than the sum of its proper divisors (1).

634688443 is an equidigital number, since it uses as much as digits as its factorization.

634688443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1327104, while the sum is 46.

The square root of 634688443 is about 25193.0236970476. The cubic root of 634688443 is about 859.3832079137.

The spelling of 634688443 in words is "six hundred thirty-four million, six hundred eighty-eight thousand, four hundred forty-three".