4139129809 has 2 divisors, whose sum is σ = 4139129810. Its totient is φ = 4139129808.

The previous prime is 4139129779. The next prime is 4139129831. The reversal of 4139129809 is 9089219314.

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., 4007523025 + 131606784 = 63305^2 + 11472^2 .

It is a cyclic number.

It is not a de Polignac number, because 4139129809 - 2⁹ = 4139129297 is a prime.

It is not a weakly prime, because it can be changed into another prime (4139129849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2069564904 + 2069564905.

It is an arithmetic number, because the mean of its divisors is an integer number (2069564905).

Almost surely, 2^4139129809 is an apocalyptic number.

It is an amenable number.

4139129809 is a deficient number, since it is larger than the sum of its proper divisors (1).

4139129809 is an equidigital number, since it uses as much as digits as its factorization.

4139129809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 4139129809 is about 64336.0692691122. The cubic root of 4139129809 is about 1605.5962638701.

The spelling of 4139129809 in words is "four billion, one hundred thirty-nine million, one hundred twenty-nine thousand, eight hundred nine".