129625825 has 18 divisors (see below), whose sum is σ = 186980406. Its totient is φ = 88885440.

The previous prime is 129625823. The next prime is 129625829. The reversal of 129625825 is 528526921.

It can be written as a sum of positive squares in 3 ways, for example, as 35904064 + 93721761 = 5992^2 + 9681^2 .

It is not a de Polignac number, because 129625825 - 2¹ = 129625823 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129625823) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 51684 + ... + 54133.

Almost surely, 2^129625825 is an apocalyptic number.

It is an amenable number.

129625825 is a deficient number, since it is larger than the sum of its proper divisors (57354581).

129625825 is a wasteful number, since it uses less digits than its factorization.

129625825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105841 (or 105829 counting only the distinct ones).

The product of its digits is 86400, while the sum is 40.

The square root of 129625825 is about 11385.3337676152. Note that the first 3 decimals coincide. The cubic root of 129625825 is about 506.0932106038.

The spelling of 129625825 in words is "one hundred twenty-nine million, six hundred twenty-five thousand, eight hundred twenty-five".