138370591 has 2 divisors, whose sum is σ = 138370592. Its totient is φ = 138370590.

The previous prime is 138370541. The next prime is 138370601. The reversal of 138370591 is 195073831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138370591 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138370591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138370541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69185295 + 69185296.

It is an arithmetic number, because the mean of its divisors is an integer number (69185296).

Almost surely, 2^138370591 is an apocalyptic number.

138370591 is a deficient number, since it is larger than the sum of its proper divisors (1).

138370591 is an equidigital number, since it uses as much as digits as its factorization.

138370591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 138370591 is about 11763.1029494772. The cubic root of 138370591 is about 517.2270925249.

The spelling of 138370591 in words is "one hundred thirty-eight million, three hundred seventy thousand, five hundred ninety-one".