129729629 has 2 divisors, whose sum is σ = 129729630. Its totient is φ = 129729628.

The previous prime is 129729563. The next prime is 129729641. The reversal of 129729629 is 926927921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125328025 + 4401604 = 11195^2 + 2098^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129729629 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129729829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64864814 + 64864815.

It is an arithmetic number, because the mean of its divisors is an integer number (64864815).

Almost surely, 2^129729629 is an apocalyptic number.

It is an amenable number.

129729629 is a deficient number, since it is larger than the sum of its proper divisors (1).

129729629 is an equidigital number, since it uses as much as digits as its factorization.

129729629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 129729629 is about 11389.8915271393. The cubic root of 129729629 is about 506.2282672376.

The spelling of 129729629 in words is "one hundred twenty-nine million, seven hundred twenty-nine thousand, six hundred twenty-nine".