129256182439 has 2 divisors, whose sum is σ = 129256182440. Its totient is φ = 129256182438.

The previous prime is 129256182413. The next prime is 129256182443. The reversal of 129256182439 is 934281652921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129256182439 - 2¹⁷ = 129256051367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129256182499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64628091219 + 64628091220.

It is an arithmetic number, because the mean of its divisors is an integer number (64628091220).

Almost surely, 2^129256182439 is an apocalyptic number.

129256182439 is a deficient number, since it is larger than the sum of its proper divisors (1).

129256182439 is an equidigital number, since it uses as much as digits as its factorization.

129256182439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 52.

The spelling of 129256182439 in words is "one hundred twenty-nine billion, two hundred fifty-six million, one hundred eighty-two thousand, four hundred thirty-nine".