129311629 has 2 divisors, whose sum is σ = 129311630. Its totient is φ = 129311628.

The previous prime is 129311627. The next prime is 129311641. The reversal of 129311629 is 926113921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120890025 + 8421604 = 10995^2 + 2902^2 .

It is an emirp because it is prime and its reverse (926113921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129311629 - 2¹ = 129311627 is a prime.

Together with 129311627, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 129311594 and 129311603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129311627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64655814 + 64655815.

It is an arithmetic number, because the mean of its divisors is an integer number (64655815).

Almost surely, 2^129311629 is an apocalyptic number.

It is an amenable number.

129311629 is a deficient number, since it is larger than the sum of its proper divisors (1).

129311629 is an equidigital number, since it uses as much as digits as its factorization.

129311629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 34.

The square root of 129311629 is about 11371.5271182018. The cubic root of 129311629 is about 505.6839785937.

The spelling of 129311629 in words is "one hundred twenty-nine million, three hundred eleven thousand, six hundred twenty-nine".