138391444913 has 2 divisors, whose sum is σ = 138391444914. Its totient is φ = 138391444912.

The previous prime is 138391444837. The next prime is 138391444973. The reversal of 138391444913 is 319444193831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86009052529 + 52382392384 = 293273^2 + 228872^2 .

It is a cyclic number.

It is not a de Polignac number, because 138391444913 - 2²⁰ = 138390396337 is a prime.

It is not a weakly prime, because it can be changed into another prime (138391444973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69195722456 + 69195722457.

It is an arithmetic number, because the mean of its divisors is an integer number (69195722457).

Almost surely, 2^138391444913 is an apocalyptic number.

It is an amenable number.

138391444913 is a deficient number, since it is larger than the sum of its proper divisors (1).

138391444913 is an equidigital number, since it uses as much as digits as its factorization.

138391444913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 50.

The spelling of 138391444913 in words is "one hundred thirty-eight billion, three hundred ninety-one million, four hundred forty-four thousand, nine hundred thirteen".