634088912209 has 27 divisors (see below), whose sum is σ = 696472654683. Its totient is φ = 577156065600.

The previous prime is 634088912207. The next prime is 634088912227. The reversal of 634088912209 is 902219880436.

The square root of 634088912209 is 796297.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 493667838225 + 140421073984 = 702615^2 + 374728^2 .

It is not a de Polignac number, because 634088912209 - 2¹ = 634088912207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634088912203) 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 in 26 ways as a sum of consecutive naturals, for example, 419647764 + ... + 419649274.

Almost surely, 2^634088912209 is an apocalyptic number.

634088912209 is the 796297-th square number.

634088912209 is the 398149-th centered octagonal number.

It is an amenable number.

634088912209 is a deficient number, since it is larger than the sum of its proper divisors (62383742474).

634088912209 is an frugal number, since it uses more digits than its factorization.

634088912209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3118 (or 1559 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 634088912209 in words is "six hundred thirty-four billion, eighty-eight million, nine hundred twelve thousand, two hundred nine".