129436129 has 9 divisors (see below), whose sum is σ = 134111601. Its totient is φ = 124919460.

The previous prime is 129436117. The next prime is 129436133. The reversal of 129436129 is 921634921.

The square root of 129436129 is 11377.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 129436129 - 2⁷ = 129436001 is a prime.

It is a super-2 number, since 2×129436129² = 33507422981009282, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129436159) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 352504 + ... + 352870.

It is an arithmetic number, because the mean of its divisors is an integer number (14901289).

Almost surely, 2^129436129 is an apocalyptic number.

129436129 is the 11377-th square number.

129436129 is the 5689-th centered octagonal number.

It is an amenable number.

129436129 is a deficient number, since it is larger than the sum of its proper divisors (4675472).

129436129 is an frugal number, since it uses more digits than its factorization.

129436129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796 (or 398 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The cubic root of 129436129 is about 505.8462157712.

The spelling of 129436129 in words is "one hundred twenty-nine million, four hundred thirty-six thousand, one hundred twenty-nine".