138662129 has 2 divisors, whose sum is σ = 138662130. Its totient is φ = 138662128.

The previous prime is 138662093. The next prime is 138662141. The reversal of 138662129 is 921266831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69689104 + 68973025 = 8348^2 + 8305^2 .

It is an emirp because it is prime and its reverse (921266831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138662129 - 2¹² = 138658033 is a prime.

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 = 138662092 and 138662101.

It is not a weakly prime, because it can be changed into another prime (138662429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69331064 + 69331065.

It is an arithmetic number, because the mean of its divisors is an integer number (69331065).

Almost surely, 2^138662129 is an apocalyptic number.

It is an amenable number.

138662129 is a deficient number, since it is larger than the sum of its proper divisors (1).

138662129 is an equidigital number, since it uses as much as digits as its factorization.

138662129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 138662129 is about 11775.4884824367. The cubic root of 138662129 is about 517.5900925242.

The spelling of 138662129 in words is "one hundred thirty-eight million, six hundred sixty-two thousand, one hundred twenty-nine".