1209173018239 has 2 divisors, whose sum is σ = 1209173018240. Its totient is φ = 1209173018238.

The previous prime is 1209173018237. The next prime is 1209173018297. The reversal of 1209173018239 is 9328103719021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1209173018239 - 2¹ = 1209173018237 is a prime.

It is a super-2 number, since 2×1209173018239² (a number of 25 digits) contains 22 as substring.

Together with 1209173018237, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1209173018231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604586509119 + 604586509120.

It is an arithmetic number, because the mean of its divisors is an integer number (604586509120).

Almost surely, 2^{1209173018239} is an apocalyptic number.

1209173018239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209173018239 is an equidigital number, since it uses as much as digits as its factorization.

1209173018239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The spelling of 1209173018239 in words is "one trillion, two hundred nine billion, one hundred seventy-three million, eighteen thousand, two hundred thirty-nine".