634889107 has 2 divisors, whose sum is σ = 634889108. Its totient is φ = 634889106.

The previous prime is 634889071. The next prime is 634889117. The reversal of 634889107 is 701988436.

It is a happy number.

Together with previous prime (634889071) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634889107 is a prime.

It is not a weakly prime, because it can be changed into another prime (634889117) 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, 317444553 + 317444554.

It is an arithmetic number, because the mean of its divisors is an integer number (317444554).

Almost surely, 2^634889107 is an apocalyptic number.

634889107 is a deficient number, since it is larger than the sum of its proper divisors (1).

634889107 is an equidigital number, since it uses as much as digits as its factorization.

634889107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 634889107 is about 25197.0059134017. The cubic root of 634889107 is about 859.4737663094.

The spelling of 634889107 in words is "six hundred thirty-four million, eight hundred eighty-nine thousand, one hundred seven".