138366497 has 2 divisors, whose sum is σ = 138366498. Its totient is φ = 138366496.

The previous prime is 138366479. The next prime is 138366521. The reversal of 138366497 is 794663831.

It is a happy number.

Together with previous prime (138366479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138274081 + 92416 = 11759^2 + 304^2 .

It is a cyclic number.

It is not a de Polignac number, because 138366497 - 2¹⁰ = 138365473 is a prime.

It is a Chen prime.

It is equal to p_7824989 and since 138366497 and 7824989 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (138366467) 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, 69183248 + 69183249.

It is an arithmetic number, because the mean of its divisors is an integer number (69183249).

Almost surely, 2^138366497 is an apocalyptic number.

It is an amenable number.

138366497 is a deficient number, since it is larger than the sum of its proper divisors (1).

138366497 is an equidigital number, since it uses as much as digits as its factorization.

138366497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 47.

The square root of 138366497 is about 11762.9289294801. The cubic root of 138366497 is about 517.2219913720.

The spelling of 138366497 in words is "one hundred thirty-eight million, three hundred sixty-six thousand, four hundred ninety-seven".