138779039041 has 4 divisors (see below), whose sum is σ = 138780932400. Its totient is φ = 138777145684.

The previous prime is 138779039039. The next prime is 138779039099. The reversal of 138779039041 is 140930977831.

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: 140930977831 = 7 ⋅20132996833.

It is a cyclic number.

It is not a de Polignac number, because 138779039041 - 2¹ = 138779039039 is a prime.

It is a super-3 number, since 3×138779039041³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138779039041.

It is not an unprimeable number, because it can be changed into a prime (138779030041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832111 + ... + 984868.

It is an arithmetic number, because the mean of its divisors is an integer number (34695233100).

Almost surely, 2^138779039041 is an apocalyptic number.

It is an amenable number.

138779039041 is a deficient number, since it is larger than the sum of its proper divisors (1893359).

138779039041 is an equidigital number, since it uses as much as digits as its factorization.

138779039041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893358.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The spelling of 138779039041 in words is "one hundred thirty-eight billion, seven hundred seventy-nine million, thirty-nine thousand, forty-one".