634821303209 has 2 divisors, whose sum is σ = 634821303210. Its totient is φ = 634821303208.

The previous prime is 634821303197. The next prime is 634821303227. The reversal of 634821303209 is 902303128436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 583268238400 + 51553064809 = 763720^2 + 227053^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634821303209 is a prime.

It is a super-2 number, since 2×634821303209² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (634821303269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317410651604 + 317410651605.

It is an arithmetic number, because the mean of its divisors is an integer number (317410651605).

Almost surely, 2^634821303209 is an apocalyptic number.

It is an amenable number.

634821303209 is a deficient number, since it is larger than the sum of its proper divisors (1).

634821303209 is an equidigital number, since it uses as much as digits as its factorization.

634821303209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 41.

The spelling of 634821303209 in words is "six hundred thirty-four billion, eight hundred twenty-one million, three hundred three thousand, two hundred nine".