209571044298137 has 2 divisors, whose sum is σ = 209571044298138. Its totient is φ = 209571044298136.

The previous prime is 209571044298127. The next prime is 209571044298149. The reversal of 209571044298137 is 731892440175902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180907987641616 + 28663056656521 = 13450204^2 + 5353789^2 .

It is a cyclic number.

It is not a de Polignac number, because 209571044298137 - 2¹⁰ = 209571044297113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209571044298137.

It is not a weakly prime, because it can be changed into another prime (209571044298127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104785522149068 + 104785522149069.

It is an arithmetic number, because the mean of its divisors is an integer number (104785522149069).

Almost surely, 2^{209571044298137} is an apocalyptic number.

It is an amenable number.

209571044298137 is a deficient number, since it is larger than the sum of its proper divisors (1).

209571044298137 is an equidigital number, since it uses as much as digits as its factorization.

209571044298137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30481920, while the sum is 62.

The spelling of 209571044298137 in words is "two hundred nine trillion, five hundred seventy-one billion, forty-four million, two hundred ninety-eight thousand, one hundred thirty-seven".