129397139 has 2 divisors, whose sum is σ = 129397140. Its totient is φ = 129397138.

The previous prime is 129397129. The next prime is 129397141. The reversal of 129397139 is 931793921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129397139 is a prime.

Together with 129397141, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129397139.

It is not a weakly prime, because it can be changed into another prime (129397109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64698569 + 64698570.

It is an arithmetic number, because the mean of its divisors is an integer number (64698570).

Almost surely, 2^129397139 is an apocalyptic number.

129397139 is a deficient number, since it is larger than the sum of its proper divisors (1).

129397139 is an equidigital number, since it uses as much as digits as its factorization.

129397139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91854, while the sum is 44.

The square root of 129397139 is about 11375.2863260667. The cubic root of 129397139 is about 505.7954187106.

The spelling of 129397139 in words is "one hundred twenty-nine million, three hundred ninety-seven thousand, one hundred thirty-nine".