138527813 has 2 divisors, whose sum is σ = 138527814. Its totient is φ = 138527812.

The previous prime is 138527801. The next prime is 138527819. The reversal of 138527813 is 318725831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84033889 + 54493924 = 9167^2 + 7382^2 .

It is a cyclic number.

It is not a de Polignac number, because 138527813 - 2⁶ = 138527749 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 (138527819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69263906 + 69263907.

It is an arithmetic number, because the mean of its divisors is an integer number (69263907).

Almost surely, 2^138527813 is an apocalyptic number.

It is an amenable number.

138527813 is a deficient number, since it is larger than the sum of its proper divisors (1).

138527813 is an equidigital number, since it uses as much as digits as its factorization.

138527813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 38.

The square root of 138527813 is about 11769.7838977612. The cubic root of 138527813 is about 517.4229161637.

The spelling of 138527813 in words is "one hundred thirty-eight million, five hundred twenty-seven thousand, eight hundred thirteen".