138691201709 has 8 divisors (see below), whose sum is σ = 142510944000. Its totient is φ = 134875213776.

The previous prime is 138691201633. The next prime is 138691201721. The reversal of 138691201709 is 907102196831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-138691201709 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 (138691251709) 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 7 ways as a sum of consecutive naturals, for example, 863609 + ... + 1011534.

It is an arithmetic number, because the mean of its divisors is an integer number (17813868000).

Almost surely, 2^138691201709 is an apocalyptic number.

It is an amenable number.

138691201709 is a deficient number, since it is larger than the sum of its proper divisors (3819742291).

138691201709 is a wasteful number, since it uses less digits than its factorization.

138691201709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1877179.

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 138691201709 in words is "one hundred thirty-eight billion, six hundred ninety-one million, two hundred one thousand, seven hundred nine".