138319697 has 2 divisors, whose sum is σ = 138319698. Its totient is φ = 138319696.

The previous prime is 138319679. The next prime is 138319711. The reversal of 138319697 is 796913831.

It is a happy number.

138319697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (138319679) 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., 137921536 + 398161 = 11744^2 + 631^2 .

It is a cyclic number.

It is not a de Polignac number, because 138319697 - 2¹⁰ = 138318673 is a prime.

It is not a weakly prime, because it can be changed into another prime (138319607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69159848 + 69159849.

It is an arithmetic number, because the mean of its divisors is an integer number (69159849).

Almost surely, 2^138319697 is an apocalyptic number.

It is an amenable number.

138319697 is a deficient number, since it is larger than the sum of its proper divisors (1).

138319697 is an equidigital number, since it uses as much as digits as its factorization.

138319697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 138319697 is about 11760.9394607744. The cubic root of 138319697 is about 517.1636710914.

The spelling of 138319697 in words is "one hundred thirty-eight million, three hundred nineteen thousand, six hundred ninety-seven".