138136591 has 2 divisors, whose sum is σ = 138136592. Its totient is φ = 138136590.

The previous prime is 138136573. The next prime is 138136639. The reversal of 138136591 is 195631831.

138136591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138136591 - 2¹⁹ = 137612303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138136591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138136571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69068295 + 69068296.

It is an arithmetic number, because the mean of its divisors is an integer number (69068296).

Almost surely, 2^138136591 is an apocalyptic number.

138136591 is a deficient number, since it is larger than the sum of its proper divisors (1).

138136591 is an equidigital number, since it uses as much as digits as its factorization.

138136591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 37.

The square root of 138136591 is about 11753.1523856368. The cubic root of 138136591 is about 516.9353652423.

The spelling of 138136591 in words is "one hundred thirty-eight million, one hundred thirty-six thousand, five hundred ninety-one".