138144911789 has 4 divisors (see below), whose sum is σ = 145415696640. Its totient is φ = 130874126940.

The previous prime is 138144911771. The next prime is 138144911819. The reversal of 138144911789 is 987119441831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 987119441831 = 11923 ⋅82791197.

It is a cyclic number.

It is not a de Polignac number, because 138144911789 - 2²⁰ = 138143863213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138144911719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3635392397 + ... + 3635392434.

It is an arithmetic number, because the mean of its divisors is an integer number (36353924160).

Almost surely, 2^138144911789 is an apocalyptic number.

138144911789 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

138144911789 is a deficient number, since it is larger than the sum of its proper divisors (7270784851).

138144911789 is an equidigital number, since it uses as much as digits as its factorization.

138144911789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7270784850.

The product of its digits is 1741824, while the sum is 56.

The spelling of 138144911789 in words is "one hundred thirty-eight billion, one hundred forty-four million, nine hundred eleven thousand, seven hundred eighty-nine".