209123391643711 has 2 divisors, whose sum is σ = 209123391643712. Its totient is φ = 209123391643710.

The previous prime is 209123391643679. The next prime is 209123391643781. The reversal of 209123391643711 is 117346193321902.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209123391643711 - 2⁵ = 209123391643679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209123391643781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104561695821855 + 104561695821856.

It is an arithmetic number, because the mean of its divisors is an integer number (104561695821856).

Almost surely, 2^{209123391643711} is an apocalyptic number.

209123391643711 is a deficient number, since it is larger than the sum of its proper divisors (1).

209123391643711 is an equidigital number, since it uses as much as digits as its factorization.

209123391643711 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The spelling of 209123391643711 in words is "two hundred nine trillion, one hundred twenty-three billion, three hundred ninety-one million, six hundred forty-three thousand, seven hundred eleven".