138218797 has 2 divisors, whose sum is σ = 138218798. Its totient is φ = 138218796.

The previous prime is 138218779. The next prime is 138218809. The reversal of 138218797 is 797812831.

Together with previous prime (138218779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111809476 + 26409321 = 10574^2 + 5139^2 .

It is a cyclic number.

It is not a de Polignac number, because 138218797 - 2¹⁵ = 138186029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138218897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69109398 + 69109399.

It is an arithmetic number, because the mean of its divisors is an integer number (69109399).

Almost surely, 2^138218797 is an apocalyptic number.

It is an amenable number.

138218797 is a deficient number, since it is larger than the sum of its proper divisors (1).

138218797 is an equidigital number, since it uses as much as digits as its factorization.

138218797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 46.

The square root of 138218797 is about 11756.6490548966. The cubic root of 138218797 is about 517.0378887938.

The spelling of 138218797 in words is "one hundred thirty-eight million, two hundred eighteen thousand, seven hundred ninety-seven".