209138048099236 has 27 divisors (see below), whose sum is σ = 366293654148513. Its totient is φ = 104482789493040.

The previous prime is 209138048099219. The next prime is 209138048099237. The reversal of 209138048099236 is 632990840831902.

The square root of 209138048099236 is 14461606.

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., 79680438432100 + 129457609667136 = 8926390^2 + 11377944^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209138048099237) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 48966995781 + ... + 48967000051.

Almost surely, 2^{209138048099236} is an apocalyptic number.

209138048099236 is the 14461606-th square number.

It is an amenable number.

209138048099236 is a deficient number, since it is larger than the sum of its proper divisors (157155606049277).

209138048099236 is an frugal number, since it uses more digits than its factorization.

209138048099236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11932 (or 5966 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 64.

The spelling of 209138048099236 in words is "two hundred nine trillion, one hundred thirty-eight billion, forty-eight million, ninety-nine thousand, two hundred thirty-six".