129125 has 8 divisors (see below), whose sum is σ = 161304. Its totient is φ = 103200.

The previous prime is 129121. The next prime is 129127. The reversal of 129125 is 521921.

It can be written as a sum of positive squares in 4 ways, for example, as 961 + 128164 = 31^2 + 358^2 .

It is not a de Polignac number, because 129125 - 2² = 129121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129097 and 129106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392 + ... + 641.

It is an arithmetic number, because the mean of its divisors is an integer number (20163).

2¹²⁹¹²⁵ is an apocalyptic number.

It is an amenable number.

129125 is a deficient number, since it is larger than the sum of its proper divisors (32179).

129125 is an equidigital number, since it uses as much as digits as its factorization.

129125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048 (or 1038 counting only the distinct ones).

The product of its digits is 180, while the sum is 20.

The square root of 129125 is about 359.3396721766. The cubic root of 129125 is about 50.5440585341.

The spelling of 129125 in words is "one hundred twenty-nine thousand, one hundred twenty-five".