1869449759789 has 2 divisors, whose sum is σ = 1869449759790. Its totient is φ = 1869449759788.

The previous prime is 1869449759783. The next prime is 1869449759893. The reversal of 1869449759789 is 9879579449681.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1033170602500 + 836279157289 = 1016450^2 + 914483^2 .

It is a cyclic number.

It is not a de Polignac number, because 1869449759789 - 2²⁰ = 1869448711213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1869449759789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1869449759783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934724879894 + 934724879895.

It is an arithmetic number, because the mean of its divisors is an integer number (934724879895).

Almost surely, 2^{1869449759789} is an apocalyptic number.

It is an amenable number.

1869449759789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1869449759789 is an equidigital number, since it uses as much as digits as its factorization.

1869449759789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9876142080, while the sum is 86.

The spelling of 1869449759789 in words is "one trillion, eight hundred sixty-nine billion, four hundred forty-nine million, seven hundred fifty-nine thousand, seven hundred eighty-nine".