138573913 has 2 divisors, whose sum is σ = 138573914. Its totient is φ = 138573912.

The previous prime is 138573901. The next prime is 138573943. The reversal of 138573913 is 319375831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130576329 + 7997584 = 11427^2 + 2828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138573913 is a prime.

It is not a weakly prime, because it can be changed into another prime (138573943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69286956 + 69286957.

It is an arithmetic number, because the mean of its divisors is an integer number (69286957).

Almost surely, 2^138573913 is an apocalyptic number.

It is an amenable number.

138573913 is a deficient number, since it is larger than the sum of its proper divisors (1).

138573913 is an equidigital number, since it uses as much as digits as its factorization.

138573913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 40.

The square root of 138573913 is about 11771.7421395476. The cubic root of 138573913 is about 517.4803066868.

The spelling of 138573913 in words is "one hundred thirty-eight million, five hundred seventy-three thousand, nine hundred thirteen".