138245121489 has 4 divisors (see below), whose sum is σ = 184326828656. Its totient is φ = 92163414324.

The previous prime is 138245121481. The next prime is 138245121517. The reversal of 138245121489 is 984121542831.

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.

It is not a de Polignac number, because 138245121489 - 2³ = 138245121481 is a prime.

It is a super-2 number, since 2×138245121489² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138245121481) 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, 23040853579 + ... + 23040853584.

It is an arithmetic number, because the mean of its divisors is an integer number (46081707164).

Almost surely, 2^138245121489 is an apocalyptic number.

It is an amenable number.

138245121489 is a deficient number, since it is larger than the sum of its proper divisors (46081707167).

138245121489 is an equidigital number, since it uses as much as digits as its factorization.

138245121489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46081707166.

The product of its digits is 552960, while the sum is 48.

The spelling of 138245121489 in words is "one hundred thirty-eight billion, two hundred forty-five million, one hundred twenty-one thousand, four hundred eighty-nine".