209268299549 has 2 divisors, whose sum is σ = 209268299550. Its totient is φ = 209268299548.

The previous prime is 209268299509. The next prime is 209268299621. The reversal of 209268299549 is 945992862902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209150728900 + 117570649 = 457330^2 + 10843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209268299549 is a prime.

It is a super-2 number, since 2×209268299549² (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 (209268299509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104634149774 + 104634149775.

It is an arithmetic number, because the mean of its divisors is an integer number (104634149775).

Almost surely, 2^209268299549 is an apocalyptic number.

It is an amenable number.

209268299549 is a deficient number, since it is larger than the sum of its proper divisors (1).

209268299549 is an equidigital number, since it uses as much as digits as its factorization.

209268299549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50388480, while the sum is 65.

The spelling of 209268299549 in words is "two hundred nine billion, two hundred sixty-eight million, two hundred ninety-nine thousand, five hundred forty-nine".