138608375231 has 4 divisors (see below), whose sum is σ = 144634826352. Its totient is φ = 132581924112.

The previous prime is 138608375221. The next prime is 138608375237. The reversal of 138608375231 is 132573806831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132573806831 = 5743 ⋅23084417.

It is a cyclic number.

It is not a de Polignac number, because 138608375231 - 2²² = 138604180927 is a prime.

It is a super-2 number, since 2×138608375231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138608375237) 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, 3013225526 + ... + 3013225571.

It is an arithmetic number, because the mean of its divisors is an integer number (36158706588).

Almost surely, 2^138608375231 is an apocalyptic number.

138608375231 is a deficient number, since it is larger than the sum of its proper divisors (6026451121).

138608375231 is an equidigital number, since it uses as much as digits as its factorization.

138608375231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6026451120.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 138608375231 in words is "one hundred thirty-eight billion, six hundred eight million, three hundred seventy-five thousand, two hundred thirty-one".