129072029 has 2 divisors, whose sum is σ = 129072030. Its totient is φ = 129072028.

The previous prime is 129071993. The next prime is 129072049. The reversal of 129072029 is 920270921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121771225 + 7300804 = 11035^2 + 2702^2 .

It is a cyclic number.

It is not a de Polignac number, because 129072029 - 2⁸ = 129071773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129071986 and 129072004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129072049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64536014 + 64536015.

It is an arithmetic number, because the mean of its divisors is an integer number (64536015).

Almost surely, 2^129072029 is an apocalyptic number.

It is an amenable number.

129072029 is a deficient number, since it is larger than the sum of its proper divisors (1).

129072029 is an equidigital number, since it uses as much as digits as its factorization.

129072029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 129072029 is about 11360.9871490113. The cubic root of 129072029 is about 505.3714601902.

The spelling of 129072029 in words is "one hundred twenty-nine million, seventy-two thousand, twenty-nine".