209986792289 has 2 divisors, whose sum is σ = 209986792290. Its totient is φ = 209986792288.

The previous prime is 209986792241. The next prime is 209986792313. The reversal of 209986792289 is 982297689902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153278514064 + 56708278225 = 391508^2 + 238135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209986792289 is a prime.

It is not a weakly prime, because it can be changed into another prime (209986792889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104993396144 + 104993396145.

It is an arithmetic number, because the mean of its divisors is an integer number (104993396145).

Almost surely, 2^209986792289 is an apocalyptic number.

It is an amenable number.

209986792289 is a deficient number, since it is larger than the sum of its proper divisors (1).

209986792289 is an equidigital number, since it uses as much as digits as its factorization.

209986792289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141087744, while the sum is 71.

The spelling of 209986792289 in words is "two hundred nine billion, nine hundred eighty-six million, seven hundred ninety-two thousand, two hundred eighty-nine".