138810629 has 2 divisors, whose sum is σ = 138810630. Its totient is φ = 138810628.

The previous prime is 138810577. The next prime is 138810631. The reversal of 138810629 is 926018831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138532900 + 277729 = 11770^2 + 527^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138810629 is a prime.

It is a Sophie Germain prime.

Together with 138810631, it forms a pair of twin primes.

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 = 138810592 and 138810601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138810649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69405314 + 69405315.

It is an arithmetic number, because the mean of its divisors is an integer number (69405315).

Almost surely, 2^138810629 is an apocalyptic number.

It is an amenable number.

138810629 is a deficient number, since it is larger than the sum of its proper divisors (1).

138810629 is an equidigital number, since it uses as much as digits as its factorization.

138810629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 138810629 is about 11781.7922660349. The cubic root of 138810629 is about 517.7747973823.

The spelling of 138810629 in words is "one hundred thirty-eight million, eight hundred ten thousand, six hundred twenty-nine".