138779226191 has 2 divisors, whose sum is σ = 138779226192. Its totient is φ = 138779226190.

The previous prime is 138779226163. The next prime is 138779226199. The reversal of 138779226191 is 191622977831.

138779226191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138779226191 - 2¹⁸ = 138778964047 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138779226199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69389613095 + 69389613096.

It is an arithmetic number, because the mean of its divisors is an integer number (69389613096).

Almost surely, 2^138779226191 is an apocalyptic number.

138779226191 is a deficient number, since it is larger than the sum of its proper divisors (1).

138779226191 is an equidigital number, since it uses as much as digits as its factorization.

138779226191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 56.

The spelling of 138779226191 in words is "one hundred thirty-eight billion, seven hundred seventy-nine million, two hundred twenty-six thousand, one hundred ninety-one".