209261648 has 10 divisors (see below), whose sum is σ = 405444474. Its totient is φ = 104630816.

The previous prime is 209261641. The next prime is 209261669. The reversal of 209261648 is 846162902.

209261648 is digitally balanced in base 3, 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., 193989184 + 15272464 = 13928^2 + 3908^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209261641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6539411 + ... + 6539442.

Almost surely, 2^209261648 is an apocalyptic number.

It is an amenable number.

209261648 is a deficient number, since it is larger than the sum of its proper divisors (196182826).

209261648 is a wasteful number, since it uses less digits than its factorization.

209261648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13078861 (or 13078855 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 209261648 is about 14465.8787496647. The cubic root of 209261648 is about 593.6947571429.

The spelling of 209261648 in words is "two hundred nine million, two hundred sixty-one thousand, six hundred forty-eight".