129729641 has 2 divisors, whose sum is σ = 129729642. Its totient is φ = 129729640.

The previous prime is 129729629. The next prime is 129729653. The reversal of 129729641 is 146927921.

It is a balanced prime because it is at equal distance from previous prime (129729629) and next prime (129729653).

It can be written as a sum of positive squares in only one way, i.e., 128029225 + 1700416 = 11315^2 + 1304^2 .

It is a cyclic number.

It is not a de Polignac number, because 129729641 - 2¹⁸ = 129467497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129729661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64864820 + 64864821.

It is an arithmetic number, because the mean of its divisors is an integer number (64864821).

Almost surely, 2^129729641 is an apocalyptic number.

It is an amenable number.

129729641 is a deficient number, since it is larger than the sum of its proper divisors (1).

129729641 is an equidigital number, since it uses as much as digits as its factorization.

129729641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 129729641 is about 11389.8920539222. The cubic root of 129729641 is about 506.2282828463.

The spelling of 129729641 in words is "one hundred twenty-nine million, seven hundred twenty-nine thousand, six hundred forty-one".