209396823589 has 2 divisors, whose sum is σ = 209396823590. Its totient is φ = 209396823588.

The previous prime is 209396823563. The next prime is 209396823613. The reversal of 209396823589 is 985328693902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209253183364 + 143640225 = 457442^2 + 11985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209396823589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209396823589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209396823529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104698411794 + 104698411795.

It is an arithmetic number, because the mean of its divisors is an integer number (104698411795).

Almost surely, 2^209396823589 is an apocalyptic number.

It is an amenable number.

209396823589 is a deficient number, since it is larger than the sum of its proper divisors (1).

209396823589 is an equidigital number, since it uses as much as digits as its factorization.

209396823589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50388480, while the sum is 64.

The spelling of 209396823589 in words is "two hundred nine billion, three hundred ninety-six million, eight hundred twenty-three thousand, five hundred eighty-nine".