209191710229 has 2 divisors, whose sum is σ = 209191710230. Its totient is φ = 209191710228.

The previous prime is 209191710139. The next prime is 209191710263. The reversal of 209191710229 is 922017191902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165650628004 + 43541082225 = 407002^2 + 208665^2 .

It is a cyclic number.

It is not a de Polignac number, because 209191710229 - 2¹¹ = 209191708181 is a prime.

It is a super-2 number, since 2×209191710229² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209191710269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104595855114 + 104595855115.

It is an arithmetic number, because the mean of its divisors is an integer number (104595855115).

Almost surely, 2^209191710229 is an apocalyptic number.

It is an amenable number.

209191710229 is a deficient number, since it is larger than the sum of its proper divisors (1).

209191710229 is an equidigital number, since it uses as much as digits as its factorization.

209191710229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 209191710229 in words is "two hundred nine billion, one hundred ninety-one million, seven hundred ten thousand, two hundred twenty-nine".