138480509 has 2 divisors, whose sum is σ = 138480510. Its totient is φ = 138480508.

The previous prime is 138480497. The next prime is 138480527. The reversal of 138480509 is 905084831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132825625 + 5654884 = 11525^2 + 2378^2 .

It is a cyclic number.

It is not a de Polignac number, because 138480509 - 2¹⁶ = 138414973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138480599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69240254 + 69240255.

It is an arithmetic number, because the mean of its divisors is an integer number (69240255).

Almost surely, 2^138480509 is an apocalyptic number.

It is an amenable number.

138480509 is a deficient number, since it is larger than the sum of its proper divisors (1).

138480509 is an equidigital number, since it uses as much as digits as its factorization.

138480509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 138480509 is about 11767.7741735640. The cubic root of 138480509 is about 517.3640135274.

The spelling of 138480509 in words is "one hundred thirty-eight million, four hundred eighty thousand, five hundred nine".