209000000209 has 72 divisors (see below), whose sum is σ = 298411270080. Its totient is φ = 142414873920.

The previous prime is 209000000191. The next prime is 209000000227. The reversal of 209000000209 is 902000000902.

It is an interprime number because it is at equal distance from previous prime (209000000191) and next prime (209000000227).

It is not a de Polignac number, because 209000000209 - 2⁹ = 208999999697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209000000209.

It is not an unprimeable number, because it can be changed into a prime (209000000009) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3948682 + ... + 4001260.

Almost surely, 2^209000000209 is an apocalyptic number.

It is an amenable number.

209000000209 is a deficient number, since it is larger than the sum of its proper divisors (89411269871).

209000000209 is a wasteful number, since it uses less digits than its factorization.

209000000209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52659 (or 52629 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 209000000209 its reverse (902000000902), we get a palindrome (1111000001111).

It can be divided in two parts, 209000000 and 209, that multiplied together give a square (43681000000 = 209000²).

The spelling of 209000000209 in words is "two hundred nine billion, two hundred nine", and thus it is an aban number.