129100825 has 12 divisors (see below), whose sum is σ = 182954560. Its totient is φ = 88526160.

The previous prime is 129100813. The next prime is 129100831. The reversal of 129100825 is 528001921.

It is not a de Polignac number, because 129100825 - 2⁵ = 129100793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129100793 and 129100802.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 368685 + ... + 369034.

Almost surely, 2^129100825 is an apocalyptic number.

It is an amenable number.

129100825 is a deficient number, since it is larger than the sum of its proper divisors (53853735).

129100825 is an equidigital number, since it uses as much as digits as its factorization.

129100825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737736 (or 737731 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 129100825 is about 11362.2543977857. The cubic root of 129100825 is about 505.4090402261.

The spelling of 129100825 in words is "one hundred twenty-nine million, one hundred thousand, eight hundred twenty-five".