209216589604 has 81 divisors (see below), whose sum is σ = 427854615601. Its totient is φ = 89431239040.

The previous prime is 209216589601. The next prime is 209216589623. The reversal of 209216589604 is 406985612902.

The square root of 209216589604 is 457402.

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

209216589604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 162884888100 + 46331701504 = 403590^2 + 215248^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209216589601) 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, 171067737 + ... + 171068959.

Almost surely, 2^209216589604 is an apocalyptic number.

209216589604 is the 457402-nd square number.

It is an amenable number.

209216589604 is an abundant number, since it is smaller than the sum of its proper divisors (218638025997).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209216589604 is a wasteful number, since it uses less digits than its factorization.

209216589604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506 (or 1253 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 209216589604 in words is "two hundred nine billion, two hundred sixteen million, five hundred eighty-nine thousand, six hundred four".