209525342209 has 4 divisors (see below), whose sum is σ = 209548024900. Its totient is φ = 209502659520.

The previous prime is 209525342197. The next prime is 209525342249. The reversal of 209525342209 is 902243525902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 161465741584 + 48059600625 = 401828^2 + 219225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209525342209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209525342249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11327484 + ... + 11345965.

It is an arithmetic number, because the mean of its divisors is an integer number (52387006225).

Almost surely, 2^209525342209 is an apocalyptic number.

It is an amenable number.

209525342209 is a deficient number, since it is larger than the sum of its proper divisors (22682691).

209525342209 is an equidigital number, since it uses as much as digits as its factorization.

209525342209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22682690.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 209525342209 in words is "two hundred nine billion, five hundred twenty-five million, three hundred forty-two thousand, two hundred nine".