138701407909 has 2 divisors, whose sum is σ = 138701407910. Its totient is φ = 138701407908.

The previous prime is 138701407883. The next prime is 138701407997. The reversal of 138701407909 is 909704107831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138276141025 + 425266884 = 371855^2 + 20622^2 .

It is a cyclic number.

It is not a de Polignac number, because 138701407909 - 2²³ = 138693019301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138701407409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69350703954 + 69350703955.

It is an arithmetic number, because the mean of its divisors is an integer number (69350703955).

Almost surely, 2^138701407909 is an apocalyptic number.

It is an amenable number.

138701407909 is a deficient number, since it is larger than the sum of its proper divisors (1).

138701407909 is an equidigital number, since it uses as much as digits as its factorization.

138701407909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 49.

The spelling of 138701407909 in words is "one hundred thirty-eight billion, seven hundred one million, four hundred seven thousand, nine hundred nine".