138606269 has 2 divisors, whose sum is σ = 138606270. Its totient is φ = 138606268.

The previous prime is 138606263. The next prime is 138606277. The reversal of 138606269 is 962606831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77968900 + 60637369 = 8830^2 + 7787^2 .

It is a cyclic number.

It is not a de Polignac number, because 138606269 - 2²⁴ = 121829053 is a prime.

It is a super-2 number, since 2×138606269² = 38423395612200722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (138606263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69303134 + 69303135.

It is an arithmetic number, because the mean of its divisors is an integer number (69303135).

Almost surely, 2^138606269 is an apocalyptic number.

It is an amenable number.

138606269 is a deficient number, since it is larger than the sum of its proper divisors (1).

138606269 is an equidigital number, since it uses as much as digits as its factorization.

138606269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 138606269 is about 11773.1163673855. The cubic root of 138606269 is about 517.5205795141.

The spelling of 138606269 in words is "one hundred thirty-eight million, six hundred six thousand, two hundred sixty-nine".