129599839 has 2 divisors, whose sum is σ = 129599840. Its totient is φ = 129599838.

The previous prime is 129599837. The next prime is 129599843. The reversal of 129599839 is 938995921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129599839 - 2¹ = 129599837 is a prime.

It is a super-2 number, since 2×129599839² = 33592236537651842, which contains 22 as substring.

Together with 129599837, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 129599839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129599831) 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, 64799919 + 64799920.

It is an arithmetic number, because the mean of its divisors is an integer number (64799920).

Almost surely, 2^129599839 is an apocalyptic number.

129599839 is a deficient number, since it is larger than the sum of its proper divisors (1).

129599839 is an equidigital number, since it uses as much as digits as its factorization.

129599839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1574640, while the sum is 55.

The square root of 129599839 is about 11384.1925053998. The cubic root of 129599839 is about 506.0593896244.

The spelling of 129599839 in words is "one hundred twenty-nine million, five hundred ninety-nine thousand, eight hundred thirty-nine".