138715601 has 4 divisors (see below), whose sum is σ = 138855732. Its totient is φ = 138575472.

The previous prime is 138715583. The next prime is 138715609. The reversal of 138715601 is 106517831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 106517831 = 7 ⋅15216833.

It can be written as a sum of positive squares in 2 ways, for example, as 133425601 + 5290000 = 11551^2 + 2300^2 .

It is a cyclic number.

It is not a de Polignac number, because 138715601 - 2¹⁴ = 138699217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138715609) 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, 68570 + ... + 70563.

It is an arithmetic number, because the mean of its divisors is an integer number (34713933).

Almost surely, 2^138715601 is an apocalyptic number.

It is an amenable number.

138715601 is a deficient number, since it is larger than the sum of its proper divisors (140131).

138715601 is an equidigital number, since it uses as much as digits as its factorization.

138715601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140130.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 138715601 is about 11777.7587426471. The cubic root of 138715601 is about 517.6566163851.

The spelling of 138715601 in words is "one hundred thirty-eight million, seven hundred fifteen thousand, six hundred one".