129925 has 6 divisors (see below), whose sum is σ = 161138. Its totient is φ = 103920.

The previous prime is 129919. The next prime is 129937. The reversal of 129925 is 529921.

It can be written as a sum of positive squares in 3 ways, for example, as 6724 + 123201 = 82^2 + 351^2 .

It is not a de Polignac number, because 129925 - 2³ = 129917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129893 and 129902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2574 + ... + 2623.

2¹²⁹⁹²⁵ is an apocalyptic number.

It is an amenable number.

129925 is a deficient number, since it is larger than the sum of its proper divisors (31213).

129925 is an equidigital number, since it uses as much as digits as its factorization.

129925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5207 (or 5202 counting only the distinct ones).

The product of its digits is 1620, while the sum is 28.

The square root of 129925 is about 360.4511062544. The cubic root of 129925 is about 50.6482263996.

The spelling of 129925 in words is "one hundred twenty-nine thousand, nine hundred twenty-five".