138480109 has 2 divisors, whose sum is σ = 138480110. Its totient is φ = 138480108.

The previous prime is 138480091. The next prime is 138480143. The reversal of 138480109 is 901084831.

It is a happy number.

Together with previous prime (138480091) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (138480143) can be obtained adding 138480109 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122655625 + 15824484 = 11075^2 + 3978^2 .

It is an emirp because it is prime and its reverse (901084831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138480109 - 2⁵ = 138480077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138480169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69240054 + 69240055.

It is an arithmetic number, because the mean of its divisors is an integer number (69240055).

Almost surely, 2^138480109 is an apocalyptic number.

It is an amenable number.

138480109 is a deficient number, since it is larger than the sum of its proper divisors (1).

138480109 is an equidigital number, since it uses as much as digits as its factorization.

138480109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 138480109 is about 11767.7571779843. The cubic root of 138480109 is about 517.3635153928.

The spelling of 138480109 in words is "one hundred thirty-eight million, four hundred eighty thousand, one hundred nine".