138687888841 has 4 divisors (see below), whose sum is σ = 138688824832. Its totient is φ = 138686952852.

The previous prime is 138687888839. The next prime is 138687888883. The reversal of 138687888841 is 148888786831.

It is a happy number.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 148888786831 = 25391 ⋅5863841.

It is a cyclic number.

It is not a de Polignac number, because 138687888841 - 2¹ = 138687888839 is a prime.

It is a super-3 number, since 3×138687888841³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138687888041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191145 + ... + 560278.

It is an arithmetic number, because the mean of its divisors is an integer number (34672206208).

Almost surely, 2^138687888841 is an apocalyptic number.

It is an amenable number.

138687888841 is a deficient number, since it is larger than the sum of its proper divisors (935991).

138687888841 is an equidigital number, since it uses as much as digits as its factorization.

138687888841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935990.

The product of its digits is 132120576, while the sum is 70.

The spelling of 138687888841 in words is "one hundred thirty-eight billion, six hundred eighty-seven million, eight hundred eighty-eight thousand, eight hundred forty-one".