209429417901749 has 2 divisors, whose sum is σ = 209429417901750. Its totient is φ = 209429417901748.

The previous prime is 209429417901707. The next prime is 209429417901797. The reversal of 209429417901749 is 947109714924902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206172782603524 + 3256635298225 = 14358718^2 + 1804615^2 .

It is a cyclic number.

It is not a de Polignac number, because 209429417901749 - 2⁸ = 209429417901493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209429417901799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104714708950874 + 104714708950875.

It is an arithmetic number, because the mean of its divisors is an integer number (104714708950875).

Almost surely, 2^{209429417901749} is an apocalyptic number.

It is an amenable number.

209429417901749 is a deficient number, since it is larger than the sum of its proper divisors (1).

209429417901749 is an equidigital number, since it uses as much as digits as its factorization.

209429417901749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82301184, while the sum is 68.

The spelling of 209429417901749 in words is "two hundred nine trillion, four hundred twenty-nine billion, four hundred seventeen million, nine hundred one thousand, seven hundred forty-nine".