209131036069 has 2 divisors, whose sum is σ = 209131036070. Its totient is φ = 209131036068.

The previous prime is 209131036013. The next prime is 209131036123. The reversal of 209131036069 is 960630131902.

209131036069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179292964900 + 29838071169 = 423430^2 + 172737^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209131036069 is a prime.

It is a super-3 number, since 3×209131036069³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209131039069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104565518034 + 104565518035.

It is an arithmetic number, because the mean of its divisors is an integer number (104565518035).

Almost surely, 2^209131036069 is an apocalyptic number.

It is an amenable number.

209131036069 is a deficient number, since it is larger than the sum of its proper divisors (1).

209131036069 is an equidigital number, since it uses as much as digits as its factorization.

209131036069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 40.

The spelling of 209131036069 in words is "two hundred nine billion, one hundred thirty-one million, thirty-six thousand, sixty-nine".