129987139 has 2 divisors, whose sum is σ = 129987140. Its totient is φ = 129987138.

The previous prime is 129987119. The next prime is 129987149. The reversal of 129987139 is 931789921.

It is a strong prime.

It is an emirp because it is prime and its reverse (931789921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129987139 - 2¹¹ = 129985091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129987092 and 129987101.

It is not a weakly prime, because it can be changed into another prime (129987119) 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, 64993569 + 64993570.

It is an arithmetic number, because the mean of its divisors is an integer number (64993570).

Almost surely, 2^129987139 is an apocalyptic number.

129987139 is a deficient number, since it is larger than the sum of its proper divisors (1).

129987139 is an equidigital number, since it uses as much as digits as its factorization.

129987139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 49.

The square root of 129987139 is about 11401.1902448823. The cubic root of 129987139 is about 506.5629959193.

The spelling of 129987139 in words is "one hundred twenty-nine million, nine hundred eighty-seven thousand, one hundred thirty-nine".