129273029 has 2 divisors, whose sum is σ = 129273030. Its totient is φ = 129273028.

The previous prime is 129272963. The next prime is 129273073. The reversal of 129273029 is 920372921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87928129 + 41344900 = 9377^2 + 6430^2 .

It is a cyclic number.

It is not a de Polignac number, because 129273029 - 2¹⁶ = 129207493 is a prime.

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 129273029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129273629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64636514 + 64636515.

It is an arithmetic number, because the mean of its divisors is an integer number (64636515).

Almost surely, 2^129273029 is an apocalyptic number.

It is an amenable number.

129273029 is a deficient number, since it is larger than the sum of its proper divisors (1).

129273029 is an equidigital number, since it uses as much as digits as its factorization.

129273029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 129273029 is about 11369.8297700537. The cubic root of 129273029 is about 505.6336574064.

The spelling of 129273029 in words is "one hundred twenty-nine million, two hundred seventy-three thousand, twenty-nine".