634398975589 has 2 divisors, whose sum is σ = 634398975590. Its totient is φ = 634398975588.

The previous prime is 634398975577. The next prime is 634398975599. The reversal of 634398975589 is 985579893436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 510753208900 + 123645766689 = 714670^2 + 351633^2 .

It is a cyclic number.

It is not a de Polignac number, because 634398975589 - 2⁵ = 634398975557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634398975559) 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, 317199487794 + 317199487795.

It is an arithmetic number, because the mean of its divisors is an integer number (317199487795).

Almost surely, 2^634398975589 is an apocalyptic number.

It is an amenable number.

634398975589 is a deficient number, since it is larger than the sum of its proper divisors (1).

634398975589 is an equidigital number, since it uses as much as digits as its factorization.

634398975589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1763596800, while the sum is 76.

The spelling of 634398975589 in words is "six hundred thirty-four billion, three hundred ninety-eight million, nine hundred seventy-five thousand, five hundred eighty-nine".