129692125 has 8 divisors (see below), whose sum is σ = 161855928. Its totient is φ = 103753600.

The previous prime is 129692083. The next prime is 129692131. The reversal of 129692125 is 521296921.

It can be written as a sum of positive squares in 4 ways, for example, as 2859481 + 126832644 = 1691^2 + 11262^2 .

It is not a de Polignac number, because 129692125 - 2⁹ = 129691613 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518644 + ... + 518893.

It is an arithmetic number, because the mean of its divisors is an integer number (20231991).

Almost surely, 2^129692125 is an apocalyptic number.

It is an amenable number.

129692125 is a deficient number, since it is larger than the sum of its proper divisors (32163803).

129692125 is an equidigital number, since it uses as much as digits as its factorization.

129692125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037552 (or 1037542 counting only the distinct ones).

The product of its digits is 19440, while the sum is 37.

The square root of 129692125 is about 11388.2450360009. The cubic root of 129692125 is about 506.1794800923.

The spelling of 129692125 in words is "one hundred twenty-nine million, six hundred ninety-two thousand, one hundred twenty-five".