138633629 has 2 divisors, whose sum is σ = 138633630. Its totient is φ = 138633628.

The previous prime is 138633559. The next prime is 138633641. The reversal of 138633629 is 926336831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120340900 + 18292729 = 10970^2 + 4277^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138633629 is a prime.

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 (138633679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69316814 + 69316815.

It is an arithmetic number, because the mean of its divisors is an integer number (69316815).

Almost surely, 2^138633629 is an apocalyptic number.

It is an amenable number.

138633629 is a deficient number, since it is larger than the sum of its proper divisors (1).

138633629 is an equidigital number, since it uses as much as digits as its factorization.

138633629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 41.

The square root of 138633629 is about 11774.2782793681. The cubic root of 138633629 is about 517.5546290358.

The spelling of 138633629 in words is "one hundred thirty-eight million, six hundred thirty-three thousand, six hundred twenty-nine".