138445513 has 2 divisors, whose sum is σ = 138445514. Its totient is φ = 138445512.

The previous prime is 138445511. The next prime is 138445519. The reversal of 138445513 is 315544831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127509264 + 10936249 = 11292^2 + 3307^2 .

It is a cyclic number.

It is not a de Polignac number, because 138445513 - 2¹ = 138445511 is a prime.

Together with 138445511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (138445511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69222756 + 69222757.

It is an arithmetic number, because the mean of its divisors is an integer number (69222757).

Almost surely, 2^138445513 is an apocalyptic number.

It is an amenable number.

138445513 is a deficient number, since it is larger than the sum of its proper divisors (1).

138445513 is an equidigital number, since it uses as much as digits as its factorization.

138445513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 34.

The square root of 138445513 is about 11766.2871374108. The cubic root of 138445513 is about 517.3204281003.

The spelling of 138445513 in words is "one hundred thirty-eight million, four hundred forty-five thousand, five hundred thirteen".