138526517 has 2 divisors, whose sum is σ = 138526518. Its totient is φ = 138526516.

The previous prime is 138526501. The next prime is 138526561. The reversal of 138526517 is 715625831.

138526517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95374756 + 43151761 = 9766^2 + 6569^2 .

It is a cyclic number.

It is not a de Polignac number, because 138526517 - 2⁴ = 138526501 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138526567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69263258 + 69263259.

It is an arithmetic number, because the mean of its divisors is an integer number (69263259).

Almost surely, 2^138526517 is an apocalyptic number.

It is an amenable number.

138526517 is a deficient number, since it is larger than the sum of its proper divisors (1).

138526517 is an equidigital number, since it uses as much as digits as its factorization.

138526517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 38.

The square root of 138526517 is about 11769.7288413965. The cubic root of 138526517 is about 517.4213025716.

The spelling of 138526517 in words is "one hundred thirty-eight million, five hundred twenty-six thousand, five hundred seventeen".