1809717072019 has 2 divisors, whose sum is σ = 1809717072020. Its totient is φ = 1809717072018.

The previous prime is 1809717072017. The next prime is 1809717072041. The reversal of 1809717072019 is 9102707179081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1809717072019 - 2¹ = 1809717072017 is a prime.

It is a super-2 number, since 2×1809717072019² (a number of 25 digits) contains 22 as substring.

Together with 1809717072017, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1809717072013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904858536009 + 904858536010.

It is an arithmetic number, because the mean of its divisors is an integer number (904858536010).

Almost surely, 2^{1809717072019} is an apocalyptic number.

1809717072019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1809717072019 is an equidigital number, since it uses as much as digits as its factorization.

1809717072019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 444528, while the sum is 52.

The spelling of 1809717072019 in words is "one trillion, eight hundred nine billion, seven hundred seventeen million, seventy-two thousand, nineteen".