138179669 has 2 divisors, whose sum is σ = 138179670. Its totient is φ = 138179668.

The previous prime is 138179659. The next prime is 138179731. The reversal of 138179669 is 966971831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137757169 + 422500 = 11737^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 138179669 - 2²⁴ = 121402453 is a prime.

It is a super-2 number, since 2×138179669² = 38187241849899122, which contains 22 as substring.

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 (138179659) 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, 69089834 + 69089835.

It is an arithmetic number, because the mean of its divisors is an integer number (69089835).

Almost surely, 2^138179669 is an apocalyptic number.

It is an amenable number.

138179669 is a deficient number, since it is larger than the sum of its proper divisors (1).

138179669 is an equidigital number, since it uses as much as digits as its factorization.

138179669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 50.

The square root of 138179669 is about 11754.9848574977. The cubic root of 138179669 is about 516.9890952185.

The spelling of 138179669 in words is "one hundred thirty-eight million, one hundred seventy-nine thousand, six hundred sixty-nine".