138673517 has 2 divisors, whose sum is σ = 138673518. Its totient is φ = 138673516.

The previous prime is 138673511. The next prime is 138673523. The reversal of 138673517 is 715376831.

It is a balanced prime because it is at equal distance from previous prime (138673511) and next prime (138673523).

It can be written as a sum of positive squares in only one way, i.e., 134119561 + 4553956 = 11581^2 + 2134^2 .

It is a cyclic number.

It is not a de Polignac number, because 138673517 - 2¹⁰ = 138672493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138673511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69336758 + 69336759.

It is an arithmetic number, because the mean of its divisors is an integer number (69336759).

Almost surely, 2^138673517 is an apocalyptic number.

It is an amenable number.

138673517 is a deficient number, since it is larger than the sum of its proper divisors (1).

138673517 is an equidigital number, since it uses as much as digits as its factorization.

138673517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 41.

The square root of 138673517 is about 11775.9720193282. The cubic root of 138673517 is about 517.6042616287.

The spelling of 138673517 in words is "one hundred thirty-eight million, six hundred seventy-three thousand, five hundred seventeen".