139440875681 has 4 divisors (see below), whose sum is σ = 139446013872. Its totient is φ = 139435737492.

The previous prime is 139440875617. The next prime is 139440875689. The reversal of 139440875681 is 186578044931.

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 an emirpimes, since its reverse is a distinct semiprime: 186578044931 = 37 ⋅5042649863.

It is a cyclic number.

It is not a de Polignac number, because 139440875681 - 2⁶ = 139440875617 is a prime.

It is a super-2 number, since 2×139440875681² (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 (139440875689) 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, 2528171 + ... + 2582736.

It is an arithmetic number, because the mean of its divisors is an integer number (34861503468).

Almost surely, 2^139440875681 is an apocalyptic number.

It is an amenable number.

139440875681 is a deficient number, since it is larger than the sum of its proper divisors (5138191).

139440875681 is an equidigital number, since it uses as much as digits as its factorization.

139440875681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5138190.

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 139440875681 in words is "one hundred thirty-nine billion, four hundred forty million, eight hundred seventy-five thousand, six hundred eighty-one".