634305509 has 2 divisors, whose sum is σ = 634305510. Its totient is φ = 634305508.

The previous prime is 634305491. The next prime is 634305533. The reversal of 634305509 is 905503436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 487968100 + 146337409 = 22090^2 + 12097^2 .

It is a cyclic number.

It is not a de Polignac number, because 634305509 - 2²⁴ = 617528293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634302509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317152754 + 317152755.

It is an arithmetic number, because the mean of its divisors is an integer number (317152755).

Almost surely, 2^634305509 is an apocalyptic number.

It is an amenable number.

634305509 is a deficient number, since it is larger than the sum of its proper divisors (1).

634305509 is an equidigital number, since it uses as much as digits as its factorization.

634305509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 35.

The square root of 634305509 is about 25185.4225495623. The cubic root of 634305509 is about 859.2103392361.

The spelling of 634305509 in words is "six hundred thirty-four million, three hundred five thousand, five hundred nine".