1209323520019 has 2 divisors, whose sum is σ = 1209323520020. Its totient is φ = 1209323520018.

The previous prime is 1209323519891. The next prime is 1209323520029. The reversal of 1209323520019 is 9100253239021.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1209323520019 - 2⁷ = 1209323519891 is a prime.

It is a super-2 number, since 2×1209323520019² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1209323520019.

It is not a weakly prime, because it can be changed into another prime (1209323520029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604661760009 + 604661760010.

It is an arithmetic number, because the mean of its divisors is an integer number (604661760010).

Almost surely, 2^{1209323520019} is an apocalyptic number.

1209323520019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209323520019 is an equidigital number, since it uses as much as digits as its factorization.

1209323520019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 37.

It can be divided in two parts, 120932 and 3520019, that added together give a triangular number (3640951 = T₂₆₉₈).

The spelling of 1209323520019 in words is "one trillion, two hundred nine billion, three hundred twenty-three million, five hundred twenty thousand, nineteen".