209243260812 has 18 divisors (see below), whose sum is σ = 488237972628. Its totient is φ = 69747225408.

The previous prime is 209243260801. The next prime is 209243260813. The reversal of 209243260812 is 218062342902.

It is not an unprimeable number, because it can be changed into a prime (209243260813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1518564 + ... + 1650612.

Almost surely, 2^209243260812 is an apocalyptic number.

It is an amenable number.

209243260812 is an abundant number, since it is smaller than the sum of its proper divisors (278994711816).

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

209243260812 is an frugal number, since it uses more digits than its factorization.

209243260812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264105 (or 132054 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The spelling of 209243260812 in words is "two hundred nine billion, two hundred forty-three million, two hundred sixty thousand, eight hundred twelve".