1323120320989 has 32 divisors (see below), whose sum is σ = 1514432177280. Its totient is φ = 1148148836352.

The previous prime is 1323120320959. The next prime is 1323120321001. The reversal of 1323120320989 is 9890230213231.

It is a cyclic number.

It is not a de Polignac number, because 1323120320989 - 2²⁵ = 1323086766557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323120320959) 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 in 31 ways as a sum of consecutive naturals, for example, 3675297 + ... + 4019209.

It is an arithmetic number, because the mean of its divisors is an integer number (47326005540).

Almost surely, 2^{1323120320989} is an apocalyptic number.

1323120320989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1323120320989 is a deficient number, since it is larger than the sum of its proper divisors (191311856291).

1323120320989 is a wasteful number, since it uses less digits than its factorization.

1323120320989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344269.

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 1323120320989 in words is "one trillion, three hundred twenty-three billion, one hundred twenty million, three hundred twenty thousand, nine hundred eighty-nine".