138129643 has 2 divisors, whose sum is σ = 138129644. Its totient is φ = 138129642.

The previous prime is 138129611. The next prime is 138129647. The reversal of 138129643 is 346921831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138129643 - 2⁵ = 138129611 is a prime.

It is not a weakly prime, because it can be changed into another prime (138129647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69064821 + 69064822.

It is an arithmetic number, because the mean of its divisors is an integer number (69064822).

Almost surely, 2^138129643 is an apocalyptic number.

138129643 is a deficient number, since it is larger than the sum of its proper divisors (1).

138129643 is an equidigital number, since it uses as much as digits as its factorization.

138129643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 138129643 is about 11752.8568016461. The cubic root of 138129643 is about 516.9266981515.

The spelling of 138129643 in words is "one hundred thirty-eight million, one hundred twenty-nine thousand, six hundred forty-three".