138252629 has 2 divisors, whose sum is σ = 138252630. Its totient is φ = 138252628.

The previous prime is 138252623. The next prime is 138252637. The reversal of 138252629 is 926252831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97318225 + 40934404 = 9865^2 + 6398^2 .

It is a cyclic number.

It is not a de Polignac number, because 138252629 - 2²⁴ = 121475413 is a prime.

It is a super-2 number, since 2×138252629² = 38227578850823282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138252592 and 138252601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138252623) 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, 69126314 + 69126315.

It is an arithmetic number, because the mean of its divisors is an integer number (69126315).

Almost surely, 2^138252629 is an apocalyptic number.

It is an amenable number.

138252629 is a deficient number, since it is larger than the sum of its proper divisors (1).

138252629 is an equidigital number, since it uses as much as digits as its factorization.

138252629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 138252629 is about 11758.0878122253. The cubic root of 138252629 is about 517.0800707044.

The spelling of 138252629 in words is "one hundred thirty-eight million, two hundred fifty-two thousand, six hundred twenty-nine".