9129825 has 18 divisors (see below), whose sum is σ = 16352934. Its totient is φ = 4869120.

The previous prime is 9129811. The next prime is 9129847. The reversal of 9129825 is 5289219.

9129825 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 904401 + 8225424 = 951^2 + 2868^2 .

It is not a de Polignac number, because 9129825 - 2⁶ = 9129761 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9129825.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 20064 + ... + 20513.

Almost surely, 2^9129825 is an apocalyptic number.

It is an amenable number.

9129825 is a deficient number, since it is larger than the sum of its proper divisors (7223109).

9129825 is a wasteful number, since it uses less digits than its factorization.

9129825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40593 (or 40585 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 9129825 is about 3021.5600275354. The cubic root of 9129825 is about 209.0037849486.

Subtracting from 9129825 its reverse (5289219), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 9129825 in words is "nine million, one hundred twenty-nine thousand, eight hundred twenty-five".